21. Occurrence of selected radionuclides in ground water used for drinking water in the United States : a reconnaissance survey, 1998 Author/Creator: Focazio, Michael J., author Publication/Creation: Reston, Virginia : U.S. Geological Survey, 2001 Resource Type: Book Access & Availability: Loading
22. An alternative regionalization scheme for defining nutrient criteria for rivers and streams Author/Creator: Robertson, Dale M. Publication/Creation: Middleton, Wis. : U.S. Dept. of the Interior, U.S. Geological Survey, 2001 Resource Type: Book Access & Availability: Loading
23. Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of pesticides in water by graphitized carbon-based solid-phase extraction and high-performance liquid chromatography/mass spectrometry Publication/Creation: Denver, Colo. : U.S. Dept. of the Interior, U.S. Geological Survey, 2001 Resource Type: Book Access & Availability: Loading
24. Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of pesticides in water by graphitized carbon-based solid-phase extraction and high-performance liquid chromatography/mass spectrometry Publication/Creation: Denver, Colo. : U.S. Dept. of the Interior, U.S. Geological Survey, 2001 Resource Type: Book Access & Availability: Loading
25. Selected data from field studies of pesticide runoff to surface waters Author/Creator: Capel, Paul D., author Publication/Creation: Sacramento, California : U.S. Department of the Interior, U.S. Geological Survey, 2001 Resource Type: Book Access & Availability: Loading
26. Occurrence and distribution of methyl tert-butyl ether and other volatile organic compounds in drinking water in the northeast and mid-atlantic regions of the United States, 1993-98 Author/Creator: Grady, Stephen J., author Publication/Creation: East Hartford, Connecticut : U.S. Department of the Interior, U.S. Geological Survey, 2001 Resource Type: Book Access & Availability: Loading
27. Quality-assurance results for routine water analyses in U.S. Geological Survey laboratories, water year 1998 Author/Creator: Ludtke, Amy S., author Publication/Creation: Denver, Colorado : U.S. Geological Survey, 2000 Resource Type: Book Access & Availability: Loading
28. A retrospective analysis on the occurrence of arsenic in ground-water resources of the United States and limitations in drinking-water-supply characterizations Author/Creator: Focazio, Michael J., author Publication/Creation: Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2000 Resource Type: Book Access & Availability: Loading
29. Microbiological monitoring for the U.S. Geological Survey National Water-Quality Assessment Program Author/Creator: Francy, Donna S., author Publication/Creation: Columbus, Ohio : U.S. Deptartment of the Interior, U.S. Geological Survey, 2000 Resource Type: Book Access & Availability: Loading
30. Laboratory study of the response of select insecticides to toxicity identification evaluation procedures Author/Creator: Kuivila, Kathryn M., author Publication/Creation: Sacramento, California : U.S. Deptartment of the Interior, U.S. Geological Survey, 1999 Resource Type: Book Access & Availability: Loading