This book is packed full of useful information for students, shark enthusiast and collectors. Compiled from years of research and collecting specimen by Jim & LeAnn Rathbone. The book is in large format 8 1/2 X 11" so the pictures can be larger for easier learning. The book has over 150 pages, 100's of photos IN COLOR. This book shows actual pictures of both jaws and teeth NOT just unidentifiable line drawings like most shark reference books, useful information about the sharks themselves. This is a must have book for fossil shark tooth collectors, modern shark tooth collectors and jaw collectors looking for an identification guide.