Raven, Peter H. Understanding biology / Peter H. Raven, George B. Johnson. - 2nd ed. - St. Louis : Mosby Year Book, c1991. - 1 v. (various pagings) : col. ill. ; 29 cm. Includes index. ISBN: 0697235033 LCCN: 90022152 Subjects--Topical Terms: Biology. LC Class. No.: QH308.2 / .R38 1991