Raven, Peter H. Biology of plants / Peter H. Raven, Ray F. Evert, Helena Curtis. - 3rd ed. - New York, N.Y. : Worth Publishers, c1971. - xvi, 686 p. : ill. (some col.) ; 29 cm. Includes bibliographies and index. ISBN: 0879011327 LCCN: 80054233 Subjects--Topical Terms: Botany. LC Class. No.: QK 47 / RAV 1971 Dewey Class. No.: 581