  1999 - Earth the Sapphire Planet (Paperback) ISBN-13: 9780486406770 ISBN-10: 0486406776 Genres: Science & Math, Engineering & Transportation ?  1992 - The Bone Hunters the Heroic Age of Paleontology in the American West (Paperback) ISBN-13: 9780486269177 ISBN-10: 0486269175 Genres: Science & Math, Outdoors & Nature ?   |
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