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2. Stability of nitrate-ion concentrations in simulated deposition samples used for quality-assurance activities by the U.S. Geological Survey
3. Statistical summary of daily values data and trend analysis of dissolved-solids data at National Stream Quality Accounting Network (NASQAN) stations
4. Regional Aquifer-System Analysis Program of the U.S. Geological Survey--bibliography, 1978-86
5. U.S. Geological Survey Toxic Substances Hydrology Program : proceedings of the Technical Meeting, Phoenix, Arizona, September 26-30, 1988
6. U.S. Geological Survey Toxic Substances Hydrology Program : proceedings of the technical meeting, Monterey, California, March 11-15, 1991
7. U.S. Geological Survey Karst Interest Group proceedings, Shepherdstown, West Virginia August 20-22, 2002
8. Summary of available state ambient stream-water-quality data, 1990-98, and limitations for national assessment
9. Summary of available state ambient stream-water-quality data, 1990-98, and limitations for national assessment
10. Cluster analysis of phytoplankton data collected from the National Stream Quality Accounting Network in the Tennessee River Basin, 1974-81
11. Water use in the United States, 1980
12. Programs and analytical methods for the U.S. Geological Survey acid rain quality-assurance project
13. External quality-assurance results for the National Atmospheric Deposition Program/National Trends Network during 1988
14. External quality-assurance results for the National Atmospheric Deposition Program and the National Trends Network during 1987
15. Computerized stratified random site-selection approaches for design of a ground-water-quality sampling network
16. Precision of the measurement of pH and specific conductance at National Atmospheric Deposition Program monitoring sites, October 1981-November 1983
17. Precision and bias of selected analytes reported by the National Atmospheric Deposition Program and National Trends Network : 1983 and January 1980 through September 1984
18. Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of moderate-use pesticides and selected degradates in water by C-18 solid-phase extraction and gas chromatography/mass spectrometry
19. A steady-state unsaturated-zone model to simulate pesticide transport
20. An alternative regionalization scheme for defining nutrient criteria for rivers and streams
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