[http]Project Gutenberg – Download College Textbooks Online(http://www.gutenberg.org/wiki/Main_Page)
[http]Free Online Science and Math Textbooks(http://spot.colorado.edu/~dubin/bookmarks/b/1240.html)

[http]Google books(http://books.google.com/)
[http]Google Scholar(http://scholar.google.com)
[http]Aussie Educator Textbooks(http://www.aussieeducator.org.au/tertiary/textbooks.html)
[http]http://textbooksfree.org

[http]http://www.freeonlinetextbooks.net/
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last modified 2012-05-08 14:46:24