CK-12 Foundation - FlexBooks®
Free, digital, and customizable STEM textbooks for K-12
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Free, digital, and customizable STEM textbooks for K-12
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CK-12 Foundation - FlexBooks®
Launch date
CK-12 Foundation - FlexBooks®Free, digital, and customizable STEM textbooks for K-12
Launched on May 19th, 2017