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* American Memory (Library of Congress)
AMSER - Applied Math and Science Education Repository
* BC Campus:Open Ed
*College Open Textbooks
*Digital Public Library of America
* Directory of Open Access Books (DOAB)
*HathiTrust - Full View
*Merlot.Org
*MIT OpenCourseware
* OAOpen.org
* OER Commons
* OERs at Internet Archive
* Open Textbook Library
* OpenStax CNX
* Project Gutenberg
* World Digital Library