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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.Smithsonian Institution - United States National Museum - Bulletin 240Author: Museum of History and Technology (U.S.),Language: English, Class: T: Technology, Release Date: Sep 17, 2012

《Treasure of the Seas》
《The Train Wire: A Discussion of the Science of Train Dispatching》
《Cavanagh, Forest Ranger: A Romance of the Mountain West》
《Jenseits der Schriftkultur ? Band 1》
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