Where Students Read Textbooks FREE | Flat World Knowledge | Flat World Knowledge
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Download free ebooks at bookboon.com
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Curriki K-12 Open Curricula Community
Curriki is a hub for free, open course materials. Find thousands of course materials in a variety of subjects and grade levels, including free courses and textbooks.
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CK12.ORG - FlexBooks
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150 Free Textbooks: A Meta Collection | Open Culture
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Posted from Diigo. The rest of my favorite links are here.