Conservation in the United States / 
by A.F. Gustafson ... [et al.] 
 - Ithaca, N.Y. :  Comstock Pub.,  1949. 
 - ix, 534 p. : 
<br/><br/><label>ISBN: </label>SSCD2699 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural resources
<br/><br/><label>Dewey Class. No.: </label>333.72  / Co,3