1996 - The Observer's Book of Rocks and Minerals [Observers] (Hardcover) ISBN-13: 9781854710444 ISBN-10: 1854710443 Genres: Children's Books, Reference, Science & Math, Outdoors & Nature ? 1979 - The Observer's Book of Rocks and Minerals [Observer's Pocket] (Hardcover) ISBN-13: 9780723215783 ISBN-10: 0723215782 ? |