Kelly, Valerie J. <br/><br/>
Sources and transport of phosphorus and nitrogen during low-flow conditions in the Tualatin River, Oregon, 1991-93 / 
by Valerie J. Kelly, Dennis D. Lynch and Stewart A. Rounds. 
 - [Reston, Virginia]:   [U. S. Geological Survey],   [U. S. Department of the Interior]  [1999].  
 - vii, 94 p. :  maps, tables ;  28 cm. 
 -  2465 .
<br/><br/> Prepared in cooperation with Unified Sewerage Agency of Washington County. 
<br/><br/>Includes bibliographical references (p. 74). 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water quality--Oregon--Tualatin River<br/>Phosphorus--Environmental aspects--Oregon--Tualatin River<br/>Nitrogen--Environmental aspects--Oregon--Tualatin River
<br/><br/><label>Dewey Class. No.: </label>363.738