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 Common Rocks and Minerals of Missouri by W. D. KellerAuthor: Keller, W. D., 1900-2001,Language: English, Class: F396: United States local history: Old Southwest. Lower Mississippi Valley, Release Date: Jun 11, 2019