1998 - The Planet Observer's Handbook (Paperback) ISBN-13: 9780521627085 ISBN-10: 0521627087 Genres: Science & Math, Engineering & Transportation ? 1994 - The Planet Observer's Handbook [Cacg] (Hardcover) ISBN-13: 9780521442572 ISBN-10: 0521442575 Genres: Science & Math, Engineering & Transportation, Substores ? |