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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.Discoveries and Inventions of the Nineteenth Century by Robert RoutledgeAuthor: Routledge, Robert,Language: English, Class: T: Technology, Release Date: Apr 2, 2017

《The Indians of Carlsbad Caverns National Park》
《History of Friedrich II of Prussia ? Volume 07》
《Subspeciation in the Meadow Mouse, Microtus pennsylvanicus, in Wyoming,》
《The Vast Abyss》
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