Smith, Richard A.  1945- <br/><br/>
Analysis and interpretation of water-quality trends in major U. S. rivers, 1974-81 / 
by Richard A. Smith, Richard B. Alexander, and M. Gordon Wolman. 
 - [Washington]:   [United States Government printing office],   [1987].  
 - iv, 25 p. :  tables, maps ;  28 cm. 
 -  2307 .
<br/><br/>Includes bibliographical references (p. 22-25). 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water quality--United States<br/>Water chemistry<br/>Rivers--United States
<br/><br/><label>Dewey Class. No.: </label>551.483