Ager, D. V. (Derek Victor) Principles of paleoecology : an introduction to the study of how and where animals and plants lived in the past. - New York : McGraw-Hill, [1963] - International series in the earth sciences . Includes bibliographical references. LCCN: 62021239 /L Subjects--Topical Terms: Paleoecology.Paleontology LC Class. No.: QH542 / .A4 Dewey Class. No.: 560