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42. Occurrence of selected trace elements and organic compounds and their relation to land use in the Willamette River basin, Oregon, 1992-94
43. Occurrence of selenium and mercury in surface water, Wind River Indian Reservation, Wyoming, 1995
44. Occurrence of volatile organic compounds in drinking water from the United States : results from archived chromatograms and water samples, 1989-2000
45. Occurrence of volatile organic compounds in drinking water from the United States : results from archived chromatograms and water samples, 1989-2000
46. Occurrence, trends, and sources in particle-associated contaminants in selected streams and lakes in Fort Worth, Texas
47. One-dimensional simulation of stratification and dissolved oxygen in McCook Reservoir, Illinois
48. One-dimensional transport with inflow and storage (OTIS) : a solute transport model for streams and rivers
49. Optimization of ground-water withdrawal at the old O-Field area, Aberdeen Proving Ground, Maryland
50. An optimized network for phosphorus load monitoring for Lake Okeechobee, Florida
51. Organic and trace element contaminants in water, biota, sediment, and semipermeable membrane devices at the Tres Rios Treatment Wetlands, Phoenix, Arizona
52. Organic carbon trends, loads, and yields to the Sacramento-San Joaquin Delta, California, water years 1980-2000
53. Organic compounds and trace elements in fish tissue and bed sediment from streams in the Yellowstone River basin, Montana and Wyoming, 1998
54. Organic compounds in ground water near a sanitary landfill in the town of Brookhaven, Long Island, New York
55. Organochlorine compounds in fish tissue and bed sediment in the upper Snake River Basin, Idaho and western Wyoming, 1992-94
56. Organochlorine compounds in fish tissue from the Connecticut, Housatonic, and Thames River basins study unit, 1992-94
57. Organochlorine compounds in streambed sediment and in biological tissue from streams and their relations to land use, central Arizona
58. Organochlorine compounds in streambed sediment and in biological tissue from streams and their relations to land use, central Arizona
59. Overview and bibliography of methods for evaluating the surface-water-infiltration component of the rainfall-runoff process
60. Overview of surface-water quality in Ohio's coal regions
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