Venino, Suzanne Animals Helping People / S. Venino. - Washington : National Geographic Society, 1983. - 32 p. : col. ill. ; 28 cm. - Books For Young Explorers . - Books For Young Explorers . ISBN: 0-87044-488-3 0-87044-493-X Subjects--Topical Terms: Zoology Subjects--Index Terms: Working animals