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22. Occurrence and transport of cadmium, lead, and zinc in the Spokane River basin, Idaho and Washington, water years 1999-2001
23. Occurrence and transport of diazinon in the Sacramento River, and selected tributaries, California, during two winter storms, January-February 2001
24. Occurrence, distribution, and loads of selected pesticides in streams in the Lake Erie-Lake St. Clair Basin, 1996-98
25. Occurrence, distribution, and loads of selected pesticides in streams in the Lake Erie-Lake St. Clair Basin, 1996-98
26. Occurrence, distribution, and trends of volatile organic compounds in the Ohio River and its major tributaries, 1987-96
27. Occurrence of and trends in selected sediment-associated contaminants in Caddo Lake, East Texas, 1940-2002
28. Occurrence of arsenic in ground water of Suffolk County, New York, 1997-2002
29. Occurrence of beds of low hydraulic conductivity in surficial deposits of Florida
30. Occurrence of dissolved sodium in ground waters in basalts underlying the Columbia Plateau, Washington
31. Occurrence of dissolved solids, nutrients, atrazine, and fecal coliform bacteria during low flow in the Cheney Reservoir Watershed, south-central Kansas, 1996
32. Occurrence of fecal coliform bacteria in selected streams in Wyoming, 1990-99
33. Occurrence of fecal coliform bacteria in selected streams in Wyoming, 1990-99
34. Occurrence of natural radium-226 radioactivity in ground water of Sarasota County, Florida
35. Occurrence of nitrate and pesticides in ground water beneath three agricultural land-use settings in the eastern San Joaquin Valley, California, 1993-1995
36. Occurrence of nitrate, pesticides, and volatile organic compounds in the Kirkwood-Cohansey Aquifer system, southern New Jersey
37. Occurrence of pesticides in streams and ground water in the Puget Sound Basin, Washington, and British Columbia, 1996-98
38. Occurrence of phosphorus, nitrate, and suspended solids in streams of the Cheney Reservoir Watershed, south-central Kansas, 1997-2000
39. Occurrence of phosphorus, other nutrients, and triazine herbicides in water from the Hillsdale Lake Basin, Northeast Kansas, May 1994 through May 1995
40. Occurrence of saltwater in the alluvial aquifer in the Boeuf-Tensas Basin, Arkansas
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