Mueller, David K. <br/><br/>
Nutrients in the nation's waters :  too much of a good thing? / 
by David K. Mueller and Dennis R. Helsel ; edited by Mary A. Kidd. 
 - [Washington, D.C.] :  U.S. G.P.O.,  1996. 
 - 24 p. :  col. ill., col. maps ;  28 cm. 
 - U.S. Geological Survey circular ;  1136 .
<br/><br/>Includes bibliographical references (p. 22). 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nutrient pollution of water--United States.
<br/><br/><label>LC Class. No.: </label>TD427.N87  / M84 1996