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Search the full-text of millions of books. Use as a "discovery" tool to find books on your topic. Books in the public domain (generally, pre-1923) are available full-text. Newer books offer limited viewing--from many pages to nothing.Note: This is just for books (and some magazines). To find scholarly articles, use Google Scholar.
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Project Gutenberg is the first and largest single collection of free electronic books. They offer about 30,000 free, online books. Due to copyright restrictions, most of these are older, "classic" texts.