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| Customizable Free Flex Books |
| Ck-12.org, a non-profit organization delivers high quality k-12 educational content in the form of Flex books with a mission to provide an adaptive learning environment to students. |
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Reference/Books/ |
| Website URL |
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http://www.ck12.org |
| Added |
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22-Feb-2012 |
| Viewed |
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3 times |
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