Petulla, Joseph M. <br/><br/>
American environmental history :  the exploitation nad conservation of natural resources. 

 - San Francisco :  Boyd and Fraser,  [1977] 
<br/><br/>Bibliography. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental protection -- United States.--Environmental protection -- United States.<br/>Environmental policy -- United States.--Environmental policy -- United States.