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Project Gutenberg was the first provider of free electronic books, or eBooks. Michael Hart, founder of Project Gutenberg, invented eBooks in 1971 and his memory continues to inspire the creation of eBooks and related technologies today.Harper's Round Table, October 22, 1895 by VariousAuthor: Various,Language: English, Class: AP: General Works: Periodicals, Release Date: Jul 15, 2010

《Hiilivalkea》
《The Review Vol. 1, No. 4, April, 1911》
《Scientific American Supplement, No. 520, December 19, 1885》
《The Land of Content》
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