Smith, Richard A <br/><br/>
Natural background concentrations of nutrients in streams and rivers of the conterminous United States.  [electronic resource] 

 -  Environmental science & technology  Jul 2003 
 - 3039-47 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0013-936X 
<br/><br/><label>Standard No.: </label>10.1021/es020663b  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Climate<br/>Environmental Monitoring<br/>Models, Theoretical<br/>Nitrogen--analysis<br/>Phosphorus--analysis<br/>Rain<br/>Reference Values<br/>United States<br/>Water Movements<br/>Water Supply