1962. 191 pp. Text is fully in Spanish. Paperback in Very Good condition. Original wrappers are stiff and in Very Good condition, with slightly rounded corners. Pages are crisp, clean, and without flaw. Comunicaciones Zoologicas del Museo de Historia Natural de Montevideo, Volumen Sexto, Numbero 93, 1962 (Zoological Communications of the Natural History Museum of Montevideo, Volume 6, Number 93, 1962).