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مواقع الكتب المجانية

https://global.oup.com/education/?region=international

http://sciencedirect.com/

http://onlinebooks.library.upenn.edu/webbin/book

http://www.motionmountain.net/text.html

http://www.nab.com

http://textbooksfree.org/

http://arizona.edu

http://ascelibrary.org

http://www.4shared.com

http://www.arab-eng.org

http://t.me/Books_Links

https://www.library.virginia.edu/