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.An Estimate of the True Value of Vaccination as a Security Against Small PoxAuthor: Greenhow, T. M. (Thomas Michael), 1791-1881,Language: English, Class: RC: Medicine: Internal medicine, Release Date: Jul 18, 2015