The environmental challenge / 
edited by Willis H. Johnson and William C. Steere 
 - Rinehart and Winston, New York :  Holt,  1974 
 - viii, 357 p. :  ill. ;  23 cm. 
<br/><br/>Includes bibliographies 
<br/><br/><label>ISBN: </label>0030841852 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology<br/>Environmental protection