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National Water-Quality Assessment Program


Planned Study Units

These study units began in fiscal year 1999:


USGS National Water-Quality Assessment (NAWQA) Program
The URL for this page is <http://water.usgs.gov/nawqa/map/GR4.html>
Kerie Hitt - kjhitt@usgs.gov
Last modified: Thu Jun 11 14:04:17 1998