"Ornithosauria. An Elementary Study of Pterodactyl Bones Made from Fossil Remains Found in the Upper Green Sandstone of Cambridge and Deposited in the Woodwardian Museum, University of Cambridge" - a book written by the author Harry Gower Seely is an invaluable source of knowledge about ancient pterodactyls. The basis of this work is the study of fossil remains found in the area of Cambridge, which allowed scientists to study in detail the structure and features of the skeletons of these ancient birds. The book is a very valuable resource for the study of dinosaurs and their world and can be of interest to both professional paleontologists and lovers of ancient nature.