CK12.ORG - FlexBooks - 1 views
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Roland O'Daniel on 02 Feb 11cK-12 FlexBooks are customizable, standards-aligned, free digital textbooks for K - 12. Subject areas include: science, technology, engineering, and mathematics. Easy to use but not very adaptable within the chapters. You decide the chapters that you want in your book, but each chapter is basically a pre-made PDF.