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").
Citation Information
| Publication Year | 2006 |
|---|---|
| Title | National Water-Quality Assessment (NAWQA) Study-Unit Investigations in the conterminous United States 1991-2001 |
| DOI | 10.3133/70046917 |
| Authors | K.J. Hitt, N. Nakagaki |
| Publication Type | Report |
| Publication Subtype | USGS Unnumbered Series |
| Index ID | 70046917 |
| Record Source | USGS Publications Warehouse |