Chopra, G. L. A text book of Algae : for B. Sc. students of Indian universities / G. L. Chopra. - 14th ed. - Delhi : S. Nagin, c 1973. - iii, 358 p. : ill. ; 21 cm. Includes index. 337 337 Subjects--Topical Terms: Algae. Dewey Class. No.: 589.3 / C435