Fresh-water invertebrates of the United States /
Pennak, Robert W.
Fresh-water invertebrates of the United States / by Robert W. Pennak - New York : The Ronald Press Co., 1953 - ix, 769 p. : ill. ; 25 cm.
Includes bibliography
Freshwater invertebrates--United States
Fresh-water invertebrates of the United States / by Robert W. Pennak - New York : The Ronald Press Co., 1953 - ix, 769 p. : ill. ; 25 cm.
Includes bibliography
Freshwater invertebrates--United States
