Jennifer A. ClackGaining Ground: The Origin and Early Evolution of Tetrapods Indiana University Press 2002-06-01 0253340543 / 9780253340542 First Edition Hardcover Very Good+. /Very Good. Hardcover Light green illustrated jacket, dust jacket in archival plastic protector. Approx. 7" x 12.5", small creases to jacket corners, very light shelf wear, tightly bound.