Clements, Frederic E. (Frederic Edward), 1874-1945 Shelford, Victor E. (Victor Ernest), 1877- text book New York, J. Wiley & Sons, inc.; 1939. 1939 English Animal ecology Botany Ecology Plant ecology Zoology QH541 .C54 575.3 http://www.biodiversitylibrary.org/bibliography/6424 1068593 39018980 DLC