Denver Museum of Natural History, 1949. Third Edition, Revised. Wraps. 8vo, 198 pp., 21 figs. Spine sunned, lightly stained, and rubbed at edges; wrappers worn with a few small stains, previous owner name on front; light soiling to page edges, corners lightly bumped.
Mexico: Instituto de Investigaciones Filologicas, UNAM, 1991. First edition. Wraps. Wide 8vo, 63 pp., foldout color plates, line illus. Text in Spanish. Spine a bit sunned and rubbed, light edgewear to wrappers.