2000 - Horn of Darkness Rhinos on the Edge (Paperback) → Hardcover ISBN-13: 9780195138801 ISBN-10: 0195138805 Genres: Science & Math, Engineering & Transportation, Outdoors & Nature ? 1997 - Horn of Darkness Rhinos on the Edge (Hardcover) → Paperback ISBN-13: 9780195111132 ISBN-10: 0195111133 Genres: Science & Math, Outdoors & Nature ? 1994 - Bison (Hardcover) ISBN-13: 9780231084567 ISBN-10: 0231084560 Genres: Science & Math, Outdoors & Nature ? |