Major Surface-Water Sampling Sites in the National Water-Quality Assessment (NAWQA) Program: 1991 and 1994 Study-Unit Starts - Direct Download
Vydavatel U.S. Geological Survey, Department of the Interior
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This data set shows the 1991 and 1994 National Water-Quality Assessment (NAWQA) study units' major surface-water sampling sites. These sites are in NAWQA's fixed network and (or) in a bed sediment and tissue network.