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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.Pioneers in Canada by Harry JohnstonAuthor: Johnston, Harry, 1858-1927,Language: English, Class: F1001: North America local history: Canada, Release Date: Jul 23, 2004

《L‘Illustration, No. 2518, 30 Mai 1891》
《The Atlantic Monthly, Volume 06, No. 36, October, 1860》
《New and Original Theories of the Great Physical Forces》
《The Kansas University Science Bulletin, Vol. I, No. 2, February, 1902》
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