Sr. Software Developer


We at CK-12 are challenging traditional model of Education.  There has never been more exciting time to be in Education.  Digital transformation has opened up unique opportunities to disrupt education for the benefit of students, teachers and parents.

We believe:

  • Everyone should have free, anytime, anywhere access to high quality education materials and educational platforms.
  • Education should be personalized to each student – not one size fits all.

If this mission challenges you, if you want to revolutionize the way teachers teach and students learn, want to serve the next generation by providing them free access to highest quality learning experiences, anytime, anywhere and want to challenge the status quo, join us!

Working at CK-12 is fun and challenging.  We are reimagining our cloud-based platforms with mobile-first strategy, providing easy to use, intuitive and simple interfaces to millions of users powered by innovative web scale based architectures that are highly available.


  • Architect, design, implement and support end-to-end integrated next generation K-12 learning platforms.This includes content management systems, learning management systems, assessment system, adaptive learning environments, etc.
  • Constantly innovate by leveraging changing consumer habits, market dynamics, technology innovations and creative imagination.
  • Build systems that are highly scalable, available and cost efficient; Lead entire software platform / modules working with geographically distributed teams.
  • Work with end users, educational institutions and partners to understand their needs and pain points; Evaluate and select emerging open standards and components to complement widely adopted infrastructure products


  • M.S. in Computer Science, or related field
  • At least 6 months in position offered or incl. development of  end to end solutions
  • Architecting modular server side components, including REST based APIs with component abstraction
  • Virtualization, and Cloud Computing
  • NoSQL Database
  • Use of  Python, Linux/Unix and MySQL
  • Data Mining/Machine Learning
  • Build frameworks, configuring and integrating open source components
  • Technical leadership and mentoring geographically distributed developers

Hiring Requirements: Background and Reference Checks

If interested, please send resume and cover letter to with subject line “Sr.  Software Developer”.

User Interaction Designer

Location: Palo Alto

Areas of responsibility:

  • Lead efforts to define detailed user interface requirements (business, functional, and end-user) for CK-12 next generation educational and learning tools.
  • Drive creation of conceptual models, user requirements, and usability objectives aligned with user centered design goals and tasks.
  • Produce designs to ensure user interface requirements are captured.
  • Develop UI prototypes for usability testing.
  • Conduct IA/UI/UE design reviews.
  • Work with a cross functional team on every stage of design and development from concept to completion.

Education: Degree/Major: BA/MA, BS/MS
Experience: 5+ years of software UI design experience with related usability knowledge.

  • Be Creative, Innovative, and experimental
  • User-Centered Design – Create solutions from observations to sketches to wireframes to interactive prototypes.
  • Information Architecture/User Interface/Experience Design – Author conceptual models, interaction flow diagrams, navigational maps, wireframes, and mockups.
  • Usability Testing – Support testing of the interaction designs and prototypes; analyze the results to incorporate field data into iterations.
  • Proven effectiveness working within cross-functional team including user researcher and visual designer.
  • Commitment to product quality and the building an exception end-user experience.

All candidates must send an online portfolio or work samples. This is a fulltime position.

If interested, please send resume and cover letter to with subject line “User Interaction Designer”.

CK-12 Interns

 2013 Summer Program

Masha Andreyeva
UC Berkeley, Freshman (Palo Alto High School)

I want to thank CK-12 for offering me this great opportunity to learn and be a part of a cause I value. It was fun for me to learn more about nutrition as I researched about lipids and neuroglia, and to spend hours coming up with quirky real world applications. I’m also very grateful to the Stephanie Hom and the UX Design team for  including me in their projects and helping me learn more about the career field I’m interested in. Thank you CK-12!

Kyle Bardman
University of Chicago, Freshman (graduated from Mountain View High School)

Ellaine Chou
Gunn High School, Sophomore

There are many perks of being a CK-12 intern. One, you make friends. There are many other interns around the same age. It is impossible to not make friends in this workplace. Second, the working environment is comfortable and quiet. There is no stress or pressure – besides debating on what food you want to eat.

Jeremy Folk
Gunn High School, Senior

I enjoyed being a CK-12 intern because I got the opportunity to work with other students just as passionate about taking what we’ve learned in our science classes and presenting it in a fun short concept in action.

Kamran Gossieaux
New York University, Freshman (graduated from Andover High School)

Hope Hahn
Cornell University, Freshman (graduated from Mountain View High School)

What I enjoyed the most about being a CK-12 intern was working in a professional environment with passionate people and getting a glimpse at the inner workings of a non-profit.

Apoorva Handigol
American High School, Junior

Working with CK-12 has gifted me with skills and memories I will always cherish: purpose, responsibility, dedication, work experience, teamwork, and laughs, of course. I hope I have provided this amazing, benevolent company with as much as CK-12 has provided me!

Shoumick M. Hasan
Graduated from Tower Hill School

Mark Holmstrom
Stanford University, Freshman (graduated from Live Oak High School)

Ryan Huang
Palo Alto High School, Junior

My favorite part about working at CK12 was being able to create my own content that would be published on the site. I also liked meeting the wide variety of people that worked here.

Peter Kuimelis
Palo Alto High School, Junior

Nina Krishnan
Mission San Jose High School, Senior

Tiffany Kwok
Cupertino High School, Junior

Through interning at CK-12 I learned more about how online textbooks make education more accessible to everyone. It also gave me the chance to apply the knowledge I know in a setting outside of school. Knowing that I was making an impact on other students’ lives through my project at CK-12 was truly a rewarding experience.

Savanna Li
Rhode Island School of Design, Freshman (Los Altos High School)

You won’t regret coming to CK-12 as an intern! It has been an absolute honor being here! First, all the people here are inviting and fun. They’re really great role models and are very passionate! Second, it’s amazing to see this company continuously transform and change. It’s really awesome to be a part of this growing community and it feels good to know that our work and suggestions are going to help students like us. Third, it’s probably been said a lot, but you do really get the experience of working in a company. You brainstorm and work with your peers, attend meetings, and talk with people on a professional level (at least you try). Third, did I mention the food? Super good! But all jokes aside, it has been a great experience here and I hope I can return with better skills to assist this organization. Thanks for having me here!

Rico Lin
UC Davis, Freshman (Mountain View High School)

I enjoy working at CK-12 because it is an opportunity for me to reinforce the things that I have learned in high school so that I am much better prepared for college.

Juan Lopez
Eastside College Preparatory School, Junior

Mayakisha Lusebrink
Graduated from Stanbridge Academy

Adam Mansour
UC Berkeley, Freshman (graduated from Palo Alto High School)

Hemang Mehta
American High School, Junior

Sahana Naranyanan
Harker School, Sophomore

Viet Nguyen
Brown University, Freshman (Mountain View High School)

Through CK-12 I was able to find my passion for education and learning. I enjoyed working in such a passionate environment with people who were dedicated to CK-12’s mission.

Galaxy Portillo
San Francisco State University, Freshman (Eastside College Preparatory School)

Jaisel Sandhu
Palo Alto High School, Junior

Working at CK12 was the highlight of my summer and a great experience. I love the idea of free online textbooks, and CK12 provided me with an opportunity to contribute to them. The people I met and worked with were very friendly and a pleasure to be around.

Vinay Satish
American High School, Senior

What I enjoyed the most about working at CK-12 was that I got to work almost as a regular, full-time employee! I got to access the key-activated employee entrance, work in a cubicle, and enjoy nearly full access to the kitchen! Most of all, I became a key contributor to the direction that the company is taking by publishing my own original content on the website and providing feedback! It was a real pleasure working with all of the employees and interns, and I would certainly like to do so again in the future!

Vishal Satish
American High School, Senior

Being a CK-12 intern meant creating interesting resources for use by other students like me, an opportunity that I always found exciting. The experience of coming to CK-12 every week and working with interns and employees to do something worthwhile for education kept me engaged often. And of course, the treasures of the kitchen were always a plus! I hope to work at CK-12 sometime again in the future!

Stefano Scotti
Mountain View High School, Junior

Helena Steffens
Los Altos High School, Senior

I really enjoyed being an intern and further advancing CK-12’s website with new material. I loved being able to use my creativity to write Real World Applications, which were later posted on the website, and hopefully used by people who needed help with certain concepts!

Jeffrey Wang
Gunn High School, Senior

I really loved the friendly and warm environment at CK-12.  I learned so much working here; it was an awesome experience!

Charles Yu
Palo Alto High School, Junior

Working at CK-12 was an extraordinary experience. As an intern, I often had to think outside of the box. Whether it be creating real world applications or planning office parties, the work at CK-12 always kept me on my feet! What I especially enjoyed was the friendly and relaxed atmosphere that CK-12 had to offer!

 2012 Summer Program

Helena Abbott
Menlo School, Senior

Lianne Blodgett
Crystal Springs Uplands School, Sophomore

Hunter Brown
Menlo School, Senior

This past summer I worked as an intern at CK12 and helped write and edit many of the earth science study guides. In addition to this I created physics, algebra, and geometry flashcards. I love to learn new things and am primarily interested in mathematics, sciences, and social sciences.

Amy Chang
University of Oxford, Freshman (graduated from Gunn High School)

Lynn Chui
Gunn High School, Senior

Audrey Flower
Menlo School, Sophomore

As a member of the critical thinking group, I worked to create stimulating and thought-provoking questions about each concept that allows students to research the topic in more depth and learn about its connections and uses in the real world. In addition I found engaging videos, simulations and interactives that help further teach the concept to students. At Menlo, my interests include water polo mock trial and community service.

Kelsey Flower
Menlo School, Junior

This summer I worked as part of the Study Guide team, writing, editing, and formatting Earth Science study guides on topics such as Earthquake Characteristics and Location and Direction.  I also worked on the social media project where I analyzed existing social media sites and highlighted the aspects of popular social networks that create strong communities and make these networks thrive.  I then brainstormed ways of transferring these aspects to an educational CK-12 social media site and identified other unique features that would make the CK-12 social network successful. In addition to academics, I play on our school tennis team, litigate as a pretrial attorney in our mock trial club, and am the Public Relations coordinator and an editor for my school’s newspaper.

Mark Holmstrom
Live Oak High School, Senior

Justin Jiang
Homestead High School, Senior

Adarsh Kadoor
American High School, Sophomore

In summer 2012, I’ve had the privilege of interning at CK-12, which provides free online educational material. I was excited to contribute to the “Creative Critical Thinking Problems” project which created hundreds of mind-stimulating questions and researched insightful enrichment videos and simulations covering math and science. I also met wonderful people, including interns, teachers, managers, and supervisors. This internship is definitely very memorable to me!

Nina Krishnan
Mission San Jose High School, Junior

Rico Lin
Mountain View High School, Junior

Antonio Lopez
Duke University, Freshman ( graduated from Menlo School)

Michael Machlin
Menlo School, Senior

During my summer internship at CK-12, I created study guides to help students review important information and prepare for tests in subjects such as earth science and biology. In addition, I made flashcards for various topics that cover relevant vocabulary and can be used in conjunction with the corresponding study guides.

Priyanka Mahapatra
Missison San Jose High School, Junior

This summer I created flash cards and reviewed study guides for CK-12. I’m glad to have helped CK-12 in its mission to produce accessible, alternative methods of education for students across the world. In my free time, I enjoy playing tennis, playing the piano, and playing with my dog.

Danielle Pintz
Menlo School, Senior

Raghav Rajvanshy
Mission San Jose, Senior

In the summer of 2012, I worked on creating critical thinking problems mainly relating to Biology and Statistics at CK-12. Prior to this, I have also interned at a law firm and a ship management company in Hong Kong. I have also started my own non-profit that aims to save lives by promoting global sanitation in partnership with hotels

Phani Rayapaneni
American High School, Sophmore

Vikram Sivaraja
Mountain View High School, Senior

Stephen Song
Los Altos High School, Senior

Jeffrey Wang
Gunn High School, Junior

Eugene Wong
Irvington High School, Senior

Wings Yeung
Castilleja School, Sophomore

I worked with other high school interns this summer to create a list of critical thinking questions.

 2011 Summer Program

Rohit Ramkumar
Palo Alto High School, Junior

I am excited to be working at CK-12 because I like the idea of free online textbooks. I am excited to apply the things I have learned to the science study guides I am working on.

Rory Runser
UC Berkeley, Freshman (Gunn High School)

I am a fanatic about chemistry, and I hope my work at CK-12 will inspire other students to pursue chemistry (and hopefully get the chance later in life to make something explode).

Nicole Yee
UC Berkeley, Freshman (Menlo School)

I really love the idea of online textbooks and learning resources for students. It’s awesome to be able to help other students by creating study guides for them.

Christopher Addiego
Carnegie Mellon, Freshman (Menlo School)

I am excited to work at CK-12 because I will get the opportunity to apply some of the knowledge I have gained in my science courses toward helping other students by writing study guides.

Danielle Phan
Castilleja School, Senior

I am interested in making at least a small change in the lives of students, hopefully making their studying a little bit easier. I am focusing on finding and making interactive games for students.

Courtney Chuang
Bowdoin College, Freshman (Castilleja School)

I’m so excited to be interning at CK-12! I’ve always been interested in education and I really believe in the work CK-12 is doing to make educational materials more accessible and more dynamic.

Jane Li
Gunn High School, Senior

I am excited to be interning at CK-12 because it will be a great experience for me to obtain a sense of how a company functions and gain valuable real world experience in working on projects with a team at a company. I will be working on study guides for algebra.

Steve Lai
UC Berkeley, Freshman (Palo Alto High School)

I am excited to be interning at CK-12 because I want to use my knowledge to help other people, as well as learning new skills. I will be working on study guides for chemistry.

Maxine Tsang
Los Altos High, Senior

I’m excited to intern at CK-12 because they cater and support students just like me. At CK-12 I’d be helping to design a website, which I learned how to do at Freestyle Academy, a school I went to part-time last year.

Zachary Wilson
U of Brit. Columbia, Freshman (Mt. View High)

I’m excited about interning here because I’ll get to use the design skills I’ve learned in school in a real world environment.

Parker Schultz
Menlo School, Sophomore

I really like the idea of online textbooks, and I am excited to help spread a new generation of online textbooks.

Sam Eckert
Menlo School, Sophomore

I am excited to work at CK-12 because it will give me a chance to help, albeit in a small way, to introduce free textbooks to the world, and thus, again in a small way, help educate the world.

Amy Shen
Gunn High School, Sophomore

I am excited about working with other interns to contribute to CK-12!

Jamie Ayon
Eastside College Preparatory School, Junior

I am excited to be an intern at CK-12 because not only do I gain work experience but I also give back to an organization that provides a very helpful resource for teachers and students alike.

Minu Palaniappan
Saratoga High, Sophomore

I enjoy coming to CK-12 because I constantly want to learn and create new things.

Cindy Lam
Gunn High School, Senior

I’m excited to be a part of CK-12’s effort to bring effective education to students, and I hope what we accomplish here will help others be better learners.

System Administrator

Location: Palo Alto, CA
System Administrator:
This is an amazing opportunity in terms of responsibility, interesting challenges and high visibility. This position also requires strong interpersonal skills, strong project management and time management skills and a successful track record of coordinating and driving issues to resolution. We truly are looking for the highest quality candidates. This position participates in an on call rotation with the other CK-12 engineers.Core Responsibilities:

– Manage, operate, and enhance highly scalable web applications built on Amazon EC2 and S3 Infrastructure
– Building and developing deployment, automation and performance and security monitoring tools
– Working closely with the development and QA team on architecture and technologies to enhance our infrastructure

– Evaluate and select open source and standards based networking components to complement widely adopted infrastructure products
– Maintain the integrity of the internal and external network security operations
– Archive, backup and automate the recovery process
– Excellent network analysis fundamentals and robust troubleshooting skills.

– Define and Guarantee SLAs for network layers
– Provide desktop support and help for CK12 Users and Volunteers (Windows, Ubuntu Linux)
– Maintain Intranet applications for CK12’s daily operations (MediaWiki, Bugzilla, LDAP, etc.)
– Manage and monitor network access for CK12’s intranet, extranet, and internet operations (VPN, Cisco Routers, Switches, NAS)
– Define and implement the policies for desktop and network usage of the systems (Security)
– Diagnosing, as appropriate, complex systems issues with multiple influencing factors

This job is for you if your technical skills include:

• 4+ years experience with Ubuntu (or Debian equivalent)
• 2+ years supporting public or private cloud technology
• 2+ years experience with MongoDB and/or MySQL server
• Excellent troubleshooting and debugging skills for the Linux platforms
• Experience with Administering and Deploying Tomcat and Memcache (or similar technology)
• Experience with administering Amazon EC2 clusters
• Security experience and hands-on knowledge for hardening systems
• Strong Unix skills and the ability to script in Python or other code base is desirable
• Prior experience with SIP/VoIP a plus

You need to have legal authorization to work in the United States.

If interested, please send resume and cover letter to with subject line “System Administrator”.

Developer – Summer Internship

Location: Palo Alto, CA
Do you want to be a Social Entrepreneur? Come join us to have a worldwide social impact in the field of education! We are a not-for-profit organization working to bring about a change in education and help students around the world get a quality education. We are seeking highly motivated individuals to become part of a team to revolutionize K-12 global learning and textbook publishing. Through the use of a superior open educational resources environment, we are creating a major paradigm shift from traditional textbook learning and publishing to collaborative online learning and customized textbook publishing designed to foster greater relevance and resonance among teachers, students, and communities.During your internship with us, you will gain valuable experience including:- Honing your technical skills working alongside highly experienced Software Engineers
– Grow professionally
– Exposure to increased levels of responsibility while helping make quality software products
– Experience real-world and direct application of classroom studies

All we ask is you bring an open-to-learn attitude and an intense desire to grow, and if you have any of the following qualifications, that would help too –

If you wish to apply for this position, please email your resume to with ‘Engineering Internship’ in the subject line.
– Computer Science major
– Proficient in Python a plus but should at least know some object-oriented language like Java, C++, or C#
– Preferably has at least completed sophomore year

You need to have legal authorization to work in the United States.

Support Engineer

Location: Palo AltoSummary:
The purpose of the Support Engineer position is very simple: do everything you can to help resolve the user’s issue. This involves taking often challenging technical issues from the customer via phone or email and doing everything that is necessary to resolve the issue quickly and professionally. You will be expected to handle all Level 1-3 issues and your day will have a mix of all kinds of different support requests. This position works with users to determine and resolve their issues with the CK-12 FlexBook System. This position focuses on utilizing exceptional customer service skills along with technical skills and expertise to resolve application issues.

Essential duties and responsibilities include the following. Other duties may be assigned.

This position interacts with customers, partners and internal staff. The role requires coordination and support between CK-12’s end users, internal staff, and external partners to ensure satisfactory resolution of issues. This position is responsible for resolving issues that may involve short turnaround times and challenging customer interactions. Support Engineers must be able to maintain a professional attitude and composure throughout all situations. Requires written documentation of customer communications in a support ticketing system.

Bachelor’s degree (BA/BS) from four-year college or university, or equivalent combination of education and experience. One to two years related technical support experience and/or training; or equivalent combination of education and experience. Proven ability to excel in highly dynamic environments required. Prior customer support experience highly desirable.

All Support Engineers require:

  • Excellent written and verbal communication skills
  • A customer oriented mindset to be the advocate for each and every user
  • A natural love for technology that is reflected in your professional and personal life
  • A methodical mindset towards troubleshooting issues
  • Basic programming fundamentals to assist in debugging
  • Knowledge about web applications, standard web user behaviors and interactions,

An ideal candidate also has expertise in:

  • Shell scripting with Bash, Python, or other scripting language
  • Windows Desktop support
  • Linux and the LAMP Stack
  • Experience with Request Tracker or other support ticketing system
  • Programming proficiency in Python, Java, or other OO oriented language.
If you wish to apply for this position, please email your resume to with “Support Engineer” in the subject line.  Principals only, no recruiters.  US Citizens and Permanent Residents only.

Operations Engineer

Location: Palo Alto Core Responsibilities:

  • Hands on Windows & Linux Administration in a medium size LAN environment.
  • Monitoring and managing equipments and services in LAN environment like routers, switches, proxy, firewalls, storage units etc.
  • Provide Level 1 & Level 2 support to end users using trouble ticketing system.
  • Asset tracking and inventory of LAN infrastructure.
  • Managing wireless network infrastructure.
  • Setup and maintain small/medium size research LAB’s infrastructure consisting of heterogeneous network aimed at compatibility testing.
  • Provide technical support on core Linux networking services such as NFS/Network/Package Management etc.
  • Manage routine tasks like server/service health checkup, backup etc in cloud infrastructure.

Mandatory Skills:

  1. An undergraduate or graduate degree in Computer Science, Engineering or related field.
  2. Good written communication skills.
  3. Basic understanding of Network and System services.
  4. Basic working knowledge of any one Linux flavor  (commands/shell scripting, installing packages etc.)
  5. Strong conceptual understanding TCP/IP stack, OSI layers and associated protocols.

Good to have:

  1. Certifications: MCSE/MCSA/CCNA/RHCE etc.
  2. Exposed to virtualization technologies like VMware/Xen/VirtualBox.
  3. Exposed to monitoring and backup/restore tools like nagios, veritas etc.
  4. Hands on experience in configuring web, application & database servers like apache, tomcat, mysql etc.
  5. Familiarity and experience with open source applications and development environment is a plus.
If you wish to apply for this position, please email your resume to with “Operations Engineer” in the subject line.  Principals only, no recruiters.  US Citizens and Permanent Residents only.

Privacy Policy Summary

NOTICE: Our Privacy Policy has been updated and has experienced the following changes

1) Section 9 (NOTICE TO CALIFORNIA RESIDENTS – YOUR CALIFORNIA PRIVACY RIGHTS) – This entire section was moved to the front of the policy.

2)Section 3(1) – The sentence “We do not collect your personal information unless it is voluntarily disclosed by you” was deleted.

3)Section 3(1) – The last sentence was revised as “The following describes the circumstances in which we may collect personal information from and about Users.”

4)Section 10 (CONTACT US) – The reference to “TOU” was changed to “our Privacy Policy.”  Also, the section was renumbered as Section 9.

Jimmy Wales

Jimmy Wales

Jimmy “Jimbo” Wales, is an American Internet entrepreneur best known for
founding, as well as other wiki-related organizations, including
the charitable organization Wikimedia Foundation, and the for-profit company
Wikia, Inc.

Wales received his Bachelor’s degree in finance from Auburn University and his
Master’s in finance from University of Alabama. He was appointed a fellow of
the Berkman Center for Internet & Society at Harvard Law School in 2005 and in
2006, he joined the Board of Directors of the non-profit organization Creative

In January of 2001, Wales started, the online encyclopedia that
anyone can edit and today Wikipedia and its sister projects are among the
top-five most visited sites on the web (comScore, January 2009). In mid-2003,
Wales set up the Wikimedia Foundation, a non-profit organization based in St.
Petersburg, Florida, to support The Foundation, now based in
downtown San Francisco, boasts a staff of close to thirty focusing on
fundraising, technology, and programming relating to the expansion of
Wikipedia. Wales now sits on the board of trustees of the Wikimedia Foundation,
and as founder continues to act as a key spokesperson.

In 2004, Wales co-founded Wikia, Inc., a for-profit company that enables groups
of people to share information and opinions that fall outside the scope of an
encyclopedia. Wikia’s community-created wikis range from video games and
movies to finance and environmental issues. Wikia, Inc., attracts more than 30
million unique visitors per month to its 10,000+ enthusiast communities.

In 2007, The World Economic Forum recognized Wales as one of the “Young
Global Leaders.” This prestigious award acknowledges the top 250 young
leaders for their professional accomplishments, their commitment to society and
their potential to contribute to shaping the future of the world. In addition,
Wales received the “Time 100 Award” in 2006, as he was named one of the
world’s most influential people in the “Scientists & Thinkers” category.

California Free Digital Textbooks Initiative

California Free Digital Textbooks Initiative

CK-12’s FlexBooks earned perfect scores in Phase Two of Gov. Schwarzenegger’s Free Digital Textbook Initiative. read more.


CK-12 Probability
and Statistics (Basic)
(CA Textbook)
Download PDF (Link 1)
Download PDF (Link 2)

CK-12 Probability and
Statistics (Advanced)
(CA Textbook)
Download PDF (Link 1)
Download PDF(Link 2)

CK-12 Calculus
(CA Textbook)Download PDF (Link 1)
Download PDF (Link 2)

CK-12 Geometry
(CA Textbook)
Download PDF (Link 1)
Download PDF (Link 2)

CK-12 Trigonometry
(CA Textbook)
Download PDF (Link 1)
Download PDF (Link 2)


CK-12 Biology I
(CA Textbook revision)
Download PDF (Link 1)
Download PDF (Link 2)

CK-12 Earth Science
(CA Textbook revision)
Download PDF (Link 1)
Download PDF (Link 2)

CK-12 Life Science
(CA Textbook revision)
Download PDF (Link1)
Download PDF (Link 2)

CK-12 Chemistry
(CA Textbook)
Download PDF (Link 1)
Download PDF (Link 2)
For Further Program Information, Contact
CK-12 Foundation
3430 W. Bayshore Rd., Suite 101
Palo Alto, CA 94303
(650) 494-1302
(650) 494-1313
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