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http://libgen.io/
http://libgen.rs/
https://b-ok.org/
https://forum.mobilism.org/index.php?sid=6e7ceb3ef56a5db1a65753e70439b15b
https://booksc.org/
https://filechef.com
http://audiobookbay.pl/
http://pdf-giant.com/
https://magazinelib.com/
http://ebook3000.com/
http://magzus.com/
https://ebook3000.biz/
https://www.magzter.com/top-free-magazines
http://pdfmagazines.club/
https://nulledpremium.com/
https://read-any-book.com/
http://ebookscart.com/
https://epubdrive.com/
https://hotaudiobooks.com/
https://ebookpdf.com/
https://sci-hub.tw/
https://www.gutenberg.org/wiki/Main_Pag (Just use browse option and go though categories)
https://www.free-ebooks.net/
https://manybooks.net/
https://www.ibiblio.org/
http://www.authorama.com/
https://www.bartleby.com/ebook/
http://www.bibliomania.com/
http://www.readprint.com/
http://www.ebookdirectory.com/
https://www.getfreeebooks.com/
https://www.bookyards.com/en/welcome
http://digital.library.upenn.edu/books/
www.b-ok.org/
www.ebook777.com
https://8freebooks.net/
https://bookflare.org/
https://dlfeb.com/
http://gen.lib.rus.ec/
http://www.allitebooks.org/
https://www.wowebook.co/
www.pdfdrive.net (books are outdated little bit here)
http://mirknig.su/ (Russian website for books)
https://uloz.to/d8fpAg2rwEcYh/large-book-collection (Extensive collection)