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Study U.S. History online free by downloading OpenStax's United States History textbook and using our accompanying online resources.

Study general chemistry online free by downloading OpenStax's Chemistry textbook and using our accompanying online resources.

This Physics resource introduces physics and scientific processes followed by chapters focused on motion, mechanics, thermodynamics, waves, and light.

Statistics offers instruction in grade-level appropriate concepts and skills in a logical, engaging progression that begins with sampling and data.

Study calculus online free by downloading volume 1 of OpenStax's college Calculus textbook and using our accompanying online resources.

Except where otherwise noted, textbooks on this site are licensed under a Creative Commons Attribution 4.0 International License. Advanced Placement ® and AP ® are trademarks …

OpenStax provides free, peer-reviewed, openly licensed K-12 textbooks that cover a wide range of subjects.

Study biology online for free by downloading OpenStax's college Biology 2e book and using our accompanying online resources including a biology study guide.