This book, "Die Bivalven der Gosaugebilde in den nord?stlichen Alpen Beitrag zur Charakteristik der Kreideformation in ?sterreich. Volumes 11-12", by K.A. Zittel, is a replication of a book originally published before 1864. 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.