Conservation in the United states:   A documentary history 

 - New York:   Chelsea House Publishers,   1971 
 - xxv, 782p. 
 - Land and water 1900-1970 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Conservation
<br/><br/><label>Subjects--Index Terms: </label>Federal waterway 
<br/><br/><label>Universal Decimal Class. No.: </label>339.5(73)  / L1.4