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.The Sign of the Four by Arthur Conan DoyleAuthor: Doyle, Arthur Conan, 1859-1930,Language: English, Class: PR: Language and Literatures: English literature, Release Date: Mar 1, 2000