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.Philosophical Letters: or, modest Reflections upon some Opinions in NaturalAuthor: Newcastle, Margaret Cavendish, Duchess of, 1624?-1674,Language: English, Class: PR: Language and Literatures: English literature, Release Date: Dec 6, 2016