Hays, Samuel P. <br/><br/>
A history of environmental politics since 1945 / 
Samuel P. Hays 
 - Pittsburgh :  University of Pittsburgh Press,  2000 
 - ix, 256 p. ;  24 cm. 
<br/><br/>Includes bibliographical references : (p. 235-250) and index 
<br/><br/><label>ISBN: </label>0822941287  Hadiah 0822957477 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental policy--History--United States--20th century<br/>Environmentalism--History--United States--20th century