Smith, Gilbert Morgan, 1885-1959. The fresh-water algae of the United States. - 2d ed. - New York, McGraw-Hill, 1950. - vii, 719 p. illus. 24 cm. - McGraw-Hill publications in the botanical sciences . LCCN: 50011324 Subjects--Topical Terms: Freshwater algae--United States. LC Class. No.: QK571 / .S6 1950 Dewey Class. No.: 589.3 Número de Chamada: 589.3 / S648