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National Water-Quality Assessment Program


Fiscal Year 1991 Study Units

This group of study units started in fiscal year 1991:


USGS National Water-Quality Assessment (NAWQA) Program
The URL for this page is <http://water.usgs.gov/nawqa/map/GR1.html>
Kerie Hitt - kjhitt@usgs.gov
Last modified: Thu Jun 11 14:03:43 1998