Google makes over 10 million books available to read freely through careful consideration of and respect for copyright law globally: they are public-domain works, made free on request of the copyright owner, or copyright-free.
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A repository providing access to public domain and in-copyright content from a variety of sources, including Google, the Internet Archive, Microsoft, and in-house partner institution initiatives.
Open Access Publishing in European Networks (OAPEN) Library contains freely accessible academic books, mainly in the area of humanities and social sciences.