Weaver, John E. Plant ecology / John E. Weaver and Frederic E. Clements. - 2nd ed. - New Delhi : Tata McGraw-Hill, c 1978. - xxi, 601 p. : ill. ; 23 cm. Includes bibliography and index. 312 312 Subjects--Topical Terms: Plant ecology. Dewey Class. No.: 581.5 / W379p