Discovering the Outdoors :  A nature and science guide to investigating life in fields, forests, and ponds/ 
Edited by L. P. Pringle;  American Museum of Natural History. 
 - New York :  Natural History Press,   1969. 
 - 128 p. :  ill. ;  26 cm. 
<br/><br/>Index, p. 124-127 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biological sciences