Robertson, Dale M. <br/><br/>
Nutrient concentrations and their relations to the biotic integrity of nonwadeable rivers in Wisconsin / 
By Dale M. Robertson, Brian M. Weigel, and David J. Graczyk. 
 - Reston, Va. :  U.S. Dept. of the Interior, U.S. Geological Survey,  2008. 
 - xii, 81 p. :  ill. (chiefly col.), maps ;  28 cm. 
 - U. S. Geological Survey Professional paper  No. 1754 .
 - U. S. Geological Survey Professional paper  No. 1754 .
<br/><br/> "In cooperation with the Wisconsin Department of Natural Resources", also on title page 
<br/><br/>Includes bibliogr. references : (p. 72-75) 
<br/><br/><label>ISBN: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water quality biological assessment--Wisconsin<br/>Nutrient pollution of water--Wisconsin<br/>Rivers--Wisconsin<br/>Stream ecology--Wisconsin