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on Aug 13, 2018
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OpenStax – openly licensed textbooks
Maybe CK-12 Foundation[0]? Also CK-12 have FlexBook's[1].
[0]
https://www.ck12.org/
[1]
https://en.wikipedia.org/wiki/FlexBook
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[0] https://www.ck12.org/ [1] https://en.wikipedia.org/wiki/FlexBook