This book, "Die Nat?rlichen Gesteine Ihre Chemisch Mineralogische Zusammensetzung, Gewinnung, Pr?fung, Bearbeitung Und Conservirung. Band 2", by Richard Krueger, is a replication of a book originally published before 1889. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible.