LibriVox | free public domain audiobooks
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DigiLibraries | digilibraries.com
Standard Ebooks: Free and liberated ebookss | standardebooks.org
Free and liberated ebooks, carefully produced for the true book lover. Download free ebooks with professional-quality formatting and typography, in formats compatible with your ereader.
ebooks777 | ebooks777.net
LOC美国国会图书馆 | loc.gov
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Open Textbook Library | open.umn.edu
Center for Open Education
The Online Books Page
Digital.library server at Penn Libraries
