Agricultural practices and water quality / 
edited by Ted L. Willrich and George E. Smith. 
 - Ames :  Iowa State University Press,  c1970. 
 - xxvii, 415 p. : 
<br/><br/> "Result of a conference, The role of agriculture in clean water, held at Iowa State University, Ames, Iowa, November 18-20, 1969." 
<br/><br/><label>ISBN: </label>0813817455 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water
<br/><br/><label>Dewey Class. No.: </label>628.1684  / Ag