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    CK-12 Flexbooks, efficient and customizable books for all

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    CK-12 Foundation

    by CK-12 Foundation

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    rosenclark
    Really impressive video, I have used the ck12.org FlexBooks many a times as my study reference material and I found it helpful. I would suggest science, technology, engineering and math students to take advantage of this great online learning resource.
    By rosenclark4 years ago