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.A Chave do Enigma by Antonio Feliciano de CastilhoAuthor: Castilho, Antonio Feliciano de, 1800-1875,Language: Portuguese, Class: PQ: Language and Literatures: Romance literatures: French, Italian, Spanish, Portuguese, Release Date: Apr 15, 2010