Loading functions for assesment of water pollution from nonpoint sources / 
A. D. Mcelroy...[et al.] 
 - Washington :  U.S. Dept. of Commerce,  1976 
 - iii, 39 p. ;  ill. ;  28 cm. 
 - Environmental protection technology series .
<br/><br/> EPA-600/2-76-151 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Pollution
<br/><br/><label>Dewey Class. No.: </label>363.7394