New York: American Museum Natural History, 1961. First printing. Paperback. First edition, 1961. Blue softcover 4to, 128pp+19 black and white plates at rear, in addition to many in-text illustrations and several folding plates. InNear Fine- condition with sunning to spine. Contents are bright, clean and unmarked. Scarce title from the.....

New York: The American Museum of Natural History, 1956. First printing. Paperback. First edition, 1956. Softcover, illustrated, 402 pp. + plates, Very Good copy, light soiling to the pages and page-edges, some soiling and discoloration to the covers, previous owner has written an abbreviated version of the title on the.....