Ager, D. V. Principles of paleoecology, an introduction to the study of how and where animals and plants lived in the past. - New York, McGraw-Hill [1963] - 371 p. illus. 24 cm. LCCN: 62021239 Nat. Bib. No.: GB63-14961 Subjects--Topical Terms: Paleoecology. LC Class. No.: QH542 / .A4 Dewey Class. No.: 560