| 1 | Directory of Open Access Books | http://www.doabooks.org/ |
| 2 | E-Books Directory | http://www.e- booksdirectory.com/listing.php?category=73 |
| 3 | AMS Books | http://www.ams.org/publicoutreach/math-history/math-history |
| 4 | Intech | https://www.intechopen.com/books |
| 5 | Audio Books for Free | http://www.audiobooksforfree.com/screen_main.asp |
| 6 | New Free Books | http://newfreebooks.com/ |
| 7 | ACS e-Books | http://pubs.acs.org/search/advanced |
| 8 | Online book Page | http://digital.library.upenn.edu/books/index.html |
| 9 | UC Press E-Books Collection | http://publishing.cdlib.org/ucpressebooks/ |
| 10 | GPO ACCESS | http://www.gpo.gov/fdsys/ |
| 11 | INTERNET ARCHIVE | http://archive.org/details/texts |
| 12 | PROJECT GUTENBERG | http://www.gutenberg.org/wiki/Gutenberg:About |
| 13 | BOOKBOON | http://bookboon.com |
| 14 | Free books Hub | http://www.freebookshub.com/ |
| 15 | World Book | http://www.worldbook.com/ |
| 16 | Books-On-Line.com | http://www.books-on-line.com/bol/default.cfm |
| 17 | Computer Books | http://freecomputerbooks.com/ |
| 18 | Page by Page Books Online | http://www.pagebypagebooks.com/ |
| 19 | Read Print | http://www.readprint.com/ |
| 20 | World e-book Library | http://www.netlibrary.net/default.aspx |
| 21 | Biodiversity Heritage Library | http://www.biodiversitylibrary.org/ |
| 22 | Free book centre | http://www.freebookcentre.net |
| 23 | Comic books | http://www.comicbookdb.com/ |
| 24 | AR book find | http://www.arbookfind.com |
| 25 | Read Print | http://www.readprint.com/ |
| 26 | Black book online | http://www.blackbookonline.info/ |
| 27 | Fiction db | http://www.fictiondb.com/ |
| 28 | E-Books | www.pdfdrive.net |
| 29 | Open Access e-Books | http://www.digitallibrary.edu.pk/OAEBooks.html |
| 30 | Free Tech Books | http://www.freetechbooks.com/ |
| 31 | Get free books | https://Www.Getfreeebooks.Com/400-Free-Business-Sales-Career-Economics-And-Financial-Ebooks/#Humanresources |
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