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.Los Principios Matemático-Históricos y la Evolución de la LibertadAuthor: Fernández Bolívar, Víctor José, 1923-,Language: Spanish, Class: D: History: General and Eastern Hemisphere, Release Date: Oct 4, 2009