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OER : Open Educational Resources: Textbooks

American Institute of Mathematics

BCcampus OpenEd

Boundless : Hosted by Lumen Learning

Boundless Textbooks :  Art, Business, English, History, Mathematics,Sciences, and more.

Free Tech Books

 Computer science, mathematics, engineering and programming books, textbooks & lecture notes

Galileo

  College level textbooks.

LibreTexts

   LibreTexts : Click on Explore the Libraries for specific subjects. 

Biology, Business, Chemistry, Engineering, Geosciences, Humanities, Mathematics, Medicine, Photosciences, Physics, Social Sciences, Statistics.

Michigan Open Book Project : Social Studies Textbooks

Social Studies Textbooks. CC-BY-NC-SA

NOBA

NOBA : Provides modules covering the traditional scope of introductory psychology and related topics.

The Orange Grove

Open Culture

200 Free Textbooks curated from various sites.

Open Text Book Store

      Math : Algebra, Geometry, Statistics, Calculus

Open Textbook Library

Variety of topics. Each book has individual creative commons license.

OpenIntro : Statistics

Statistics  (3 Books)

OpenStax Textbooks

 OpenStax Textbooks : Math, Science, Social Studies, Humanities, Business & AP.   CC-BY

OpenStax CNX

  Two formats: modules, which are like small "knowledge chunks," and collections, which are groups of modules structured into books or course notes, or for other uses. Our open license allows for free use and reuse of all our content.

Saylor Academy Open Textbooks

  CC BY-NC-SA 3.0  

Course SiteEducators can use all or parts of books and courses.

USHistory.org : Free Textbooks

  Offers high school textbooks in US History, American Government, and Ancient Civilizations.