www.archive.org
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djvu, pdf, text, html |
The Internet Archive, a 501(c)(3) non-profit, is building a digital library of Internet sites and other cultural artifacts in digital form. Like a paper library, we provide free access to researchers, historians, scholars, and the general public. |
www.gutenberg.org
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pdf, text, html, pdb, tiff, tex, dvi |
Project Gutenberg, the first producer of free electronic books (ebooks).The Project Gutenberg collection was produced by tens of thousands of volunteers. |
freecomputerbooks.com
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Free Computer, Mathematics, Technical Books and Lecture Notes, etc. |
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freetechbooks.com
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Free Online Computer Science and Programming Books, Textbooks, and Lecture Notes |