Watt, Kenneth E. F. ,1929- <br/><br/>
Principles of environmental science 
[by] Kenneth E. F. Watt. 
 -  McGraw-Hill New York  1973  [1973] 
 - xiv, 319 p.illus.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.--QH
<br/><br/><label>LC Class. No.: </label>QH541.W28