Watt, Kenneth E. F., 1929- <br/><br/>
Principles of environmental science/ 
by Kenneth E. F. Watt. 
 - New York:  McGraw-Hill,  1973. 
 - xiv, 319 pages :   ill. ;   25 cm. 
<br/><br/>Includes bibliographies. 
<br/><br/><label>ISBN: </label>0070685754 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.<br/>Human ecology.<br/>Environmental policy.