Invertebrate zoology / Joseph G. Engemann, Robert W. Hegner. Engemann, Joseph G. Hegner, Robert William, 1880-1942, joint author. Invertebrates. QL362 .H4 1981 592 ENI In the 2d ed. Hegner's name appeared first on t.p. Includes bibliographical references and index. New York : Macmillan ; London : Collier Macmillan Publishers, c1981. c1981. 1981 Text xxi, 746 p. : eng