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2. Observed and predicted pier scour in Maine
3. Observed and simulated distribution of selected herbicides in silty loam, sandy loam, and clay soil profiles near Topeka, Kansas, 1986-88
4. An observed-streambed-scour index for selected bridges in southwestern Indiana, 1991
5. Occurrence and availability of ground water in the Athens region, northeastern Georgia
6. Occurrence and distribution of dissolved pesticides in the San Joaquin River Basin, California
7. Occurrence and distribution of dissolved trace elements in the surface waters of the Yakima River Basin, Washington
8. Occurrence and distribution of enteric viruses in shallow ground water and factors affecting well vulnerability to microbiological contamination in Worcester and Wicomico Counties, Maryland
9. 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
10. Occurrence and distribution of microbiological contamination and enteric viruses in shallow ground water in Baltimore and Harford counties, Maryland
11. Occurrence and distribution of microbiological contamination and enteric viruses in shallow ground water in Baltimore and Harford counties, Maryland
12. Occurrence and distribution of nitrate and herbicides in the Iowa River alluvial aquifer, Iowa--May 1984 to November 1985
13. Occurrence and distribution of nutrients, suspended sediment, and pesticides in the Mobile River basin, Alabama, Georgia, Mississippi, and Tennessee, 1999-2001
14. Occurrence and distribution of organochlorine compounds in biological tissue and bed sediment from streams in the Trinity River basin, Texas, 1992-93
15. Occurrence and distribution of organochlorine pesticides, polychlorinated biphenyls, and trace elements in fish tissue in the lower Tennessee River Basin, 1980-98
16. Occurrence and distribution of pesticides in the St. Lucie River watershed, south-central Florida, 2000-01, based on Enzyme-Linked Immunosorbent Assay (ELISA) screening
17. Occurrence and implications of methyl tert-butyl ether and gasoline hydrocarbons in ground water and source water in the United States and in drinking water in 12 northeast and mid-atlantic states, 1993-2002
18. Occurrence and quality of surface water and ground water within the Yavapai-Prescott Indian Reservation, central Arizona, 1994-98
19. Occurrence and seasonal variability of volatile organic compounds in seven New Jersey streams
20. Occurrence and status of volatile organic compounds in ground water from rural, untreated, self-supplied domestic wells in the United States, 1986-99
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