Purdom, P. Walton,  1917- <br/><br/>
Environmental science  managing the environment 
P. Walton Purdom and Stanley H. Anderson 
 - 2nd ed. 
 - Columbus  Charles E. Merrill Publishing Co.  1983 
 - 581 p. ; 27 cm. 
<br/><br/><label>ISBN: </label>0675200091 
<br/><br/><label>LCCN: </label>82-61501 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology<br/>Environmental protection