Opportunities to improve the U.S. Geological Survey National Water Quality Assessment Program / 
Committee to Improve the U.S. Geological Survey National Water Quality Assessment Program, Water Science and Technology Board, Division on Earth and Life Studies, National Research Council 
 - xiii, 238 páginas :  ilustraciones, mapas 
<br/><br/><label>ISBN: </label>0309083052 
<br/><br/><label>Subjects--Corporate Names: </label><br/>National Water-Quality Assessment Program (Estados Unidos)
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calidad del agua--Medición--Estados Unidos
<br/><br/><label>LC Class. No.: </label>TD223  / O66