  1999 - Eternal Trail a Tracker Looks at Evolution (Hardcover) → Paperback ISBN-13: 9780738201658 ISBN-10: 0738201650 Genres: Nonfiction, Science & Math ?  1997 - Dinosaur Lakethe Story of the Purgatoire Valley Tracksite [Special publication] (Paperback) ISBN-13: 9781884216534 ISBN-10: 1884216536 Genre: Science & Math ?  |
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