Economics of watershed planning /    
edited by G. S. Tolley and F. E . Riggs 
 - Ames :   Iowa State University Press ,   1961 
 - ix,339 p. :    maps,diagrs.,tables ;    24 cm. 
<br/><br/>Includes bibliographical  references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Watersheds--------<br/>Water resources development--------
<br/><br/><label>Dewey Class. No.: </label>333.91