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Free on-line books
http://www.magickeys.com/books/
http://kids.nypl.org/reading/Childrensebooks.cfm - list of the libraries
http://www.storyplace.org/storyplace.asp
http://www.childrenslibrary.org - the best!
http://www.mobileread.com/forums/ebooks.php?order=desc&sort=dateline - e-library for bookreader