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.Visual Signaling by United States. Army. Signal CorpsAuthor: United States. Army. Signal Corps,Language: English, Class: UG: Military science: Military engineering, Release Date: Aug 20, 2013