1960. Two Volumes. Volume 1, 187 pp; Volume 2, 160 pp. Text in Spanish. Hardcovers in good condition, original tan covers. Both volumes shaken. Light browning to the edges. Volume 2, text block has a damp wrinkle. Gilt llama on the front cover of Volume 1 and a gilt anteater on the front cover of Volume 2. For each family of South American mammals, the systematics, morphological characters, pelages, feeding habits, reproductive behavior, curiosities and folklore and geographical distribution are described. Representative species from each family are depicted in full color.