Hancocks, David. Master builders of the animal world. - [1st U.S. ed.] - New York, Harper & Row [1973] - 144 p. illus. 25 cm. Bibliography: p. 138-139. ISBN: 0060117575 Source: $8.95 LCCN: 73005456 //r83 Subjects--Topical Terms: Animals--Habitations. LC Class. No.: QL756 / .H34 1973 Dewey Class. No.: 591.5/6