Ager, Derek V. Principles of paleoecology : an introduction to the study of how and where animals and plants lived in the past / Derek V. Ager - New York : McGraw-Hill, c1963. - xi,371 p.: table, figs., ill.; 24 cm. - International series in the earth sciences . Includes index Includes bibliographical reference p.319-345 English Subjects--Topical Terms: PaleoecologyPaleontology Dewey Class. No.: 560.45/AGP