Economics of watershed planning /  
edited by G. S. Tolley and F. E. Riggs. 
 - Lowa :   The lowa state university press,   c 1961. 
 - ix, 339 p. :   ill. ;  23 cm. 
<br/><br/> Includes index. 
<br/><br/>336  336 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water resources development.
<br/><br/><label>Dewey Class. No.: </label>333.91 / J579e