National Water-Quality Assessment (NAWQA) Study-Unit Investigations in the conterminous United States 1991-2001
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资源简介：
This is a coverage of the boundaries and codes used for the
U.S. Geological Survey's National Water-Quality Assessment (NAWQA)
Program Study-Unit investigations in the conterminous United
States, excluding the High Plains Regional Ground-Water Study.
The data set represents the areas studied during the first decade
of the NAWQA Program, from 1991-2001 ("cycle 1").
创建时间：
2016-10-29
