مواقع ذو خدمات مميزة
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http://search.4shared.com
http://search.2shared.com/
http://www.docstoc.com
http://www.pdf-search-engine.com/
http://pdfaz.com/
http://www.gutenberg.org
http://www.infomine.ucr.edu/
http://www.academicinfo.net/
www.cyber411.com
www.metacrawler.com
www.northernlight.com
http://search.mywebsearch.com
http://www.metacrawler.com
http://www.dogpile.com
http://www.profusion.com
http://vivisimo.com
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