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2. Occurrence of arsenic in ground water of Suffolk County, New York, 1997-2002
3. Occurrence and distribution of dissolved trace elements in the surface waters of the Yakima River Basin, Washington
4. Occurrence and distribution of nutrients, suspended sediment, and pesticides in the Mobile River basin, Alabama, Georgia, Mississippi, and Tennessee, 1999-2001
5. Occurrence and distribution of pesticides in the St. Lucie River watershed, south-central Florida, 2000-01, based on Enzyme-Linked Immunosorbent Assay (ELISA) screening
6. Occurrence and temporal variability of methyl tert-butyl ether (MTBE) and other volatile organic compounds in select sources of drinking water : results of the focused survey
7. Occurrence and transport of cadmium, lead, and zinc in the Spokane River basin, Idaho and Washington, water years 1999-2001
8. Occurrence and transport of diazinon in the Sacramento River, and selected tributaries, California, during two winter storms, January-February 2001
9. Occurrence of and trends in selected sediment-associated contaminants in Caddo Lake, East Texas, 1940-2002
10. Occurrence of volatile organic compounds in drinking water from the United States : results from archived chromatograms and water samples, 1989-2000
11. Occurrence of volatile organic compounds in drinking water from the United States : results from archived chromatograms and water samples, 1989-2000
12. Occurrence, trends, and sources in particle-associated contaminants in selected streams and lakes in Fort Worth, Texas
13. Organic and trace element contaminants in water, biota, sediment, and semipermeable membrane devices at the Tres Rios Treatment Wetlands, Phoenix, Arizona
14. Organic carbon trends, loads, and yields to the Sacramento-San Joaquin Delta, California, water years 1980-2000
15. Overview of water resources in and near Wichita and Affiliated Tribes treaty lands in western Oklahoma
16. Oxidation-reduction processes in ground water at Naval Weapons Industrial Reserve Plant, Dallas, Texas
17. Observations of environmental change in Grand Canyon, Arizona
18. Observed and predicted pier scour in Maine
19. Occurrence and distribution of microbiological contamination and enteric viruses in shallow ground water in Baltimore and Harford counties, Maryland
20. Occurrence and distribution of microbiological contamination and enteric viruses in shallow ground water in Baltimore and Harford counties, Maryland
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