Pennak, Robert W. Fresh-water invertebrates of the United States by Robert W. Pennak - 2d ed. - New York Wiley c1978 - xv, 803 p. ill. 26 cm. "A Wiley-Interscience publication." Subjects--Topical Terms: Freshwater invertebrates--United States Dewey Class. No.: 592 / .09 / 2973