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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.The Arena, Volume 4, No. 23, October, 1891 by VariousAuthor: Various,Language: English, Class: AP: General Works: Periodicals, Release Date: Dec 10, 2007

《On the Age of Maya Ruins》
《Experiments with Alternate Currents of High Potential and High Frequency》
《What Christmas Did for Jerusha Grumble》
《On the Frontier》
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