  Exploring the Highest Sierra (Paperback) → Hardcover ISBN-13: 9780804737036 ISBN-10: 0804737037 Genres: History, Travel, Science & Math, Engineering & Transportation ?  King of the 40th Parallel Discovery in the American West (Hardcover) → Paperback ISBN-13: 9780804752220 ISBN-10: 0804752222 ?  King of the 40th Parallel Discovery in the American West (Paperback) → Hardcover ISBN-13: 9780804752237 ISBN-10: 0804752230 Genres: Biographies & Memoirs, History, Science & Math, Engineering & Transportation ? |
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