41. 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
42. Occurrence of selected trace elements and organic compounds and their relation to land use in the Willamette River basin, Oregon, 1992-94 Author/Creator: Anderson, Chauncey W., author Publication/Creation: Portland, Oregon : U.S. Department of the Interior, U.S. Geological Survey, 1996 Resource Type: Book Access & Availability: Loading
43. Occurrence of selenium and mercury in surface water, Wind River Indian Reservation, Wyoming, 1995 Author/Creator: Clark, Melanie L., author Publication/Creation: Cheyenne, Wyoming : U.S. Geological Survey, 1996 Resource Type: Book Access & Availability: Loading
44. Occurrence of volatile organic compounds in drinking water from the United States : results from archived chromatograms and water samples, 1989-2000 Publication/Creation: Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2003 Resource Type: Book Access & Availability: Loading
45. Occurrence of volatile organic compounds in drinking water from the United States : results from archived chromatograms and water samples, 1989-2000 Publication/Creation: Denver, CO : U.S. Geological Survey, Information Services [distributor] Resource Type: Book Access & Availability: Loading
46. Occurrence, trends, and sources in particle-associated contaminants in selected streams and lakes in Fort Worth, Texas Publication/Creation: Denver, CO : U.S. Geological Survey, Information Services [distributor]. Resource Type: Book Access & Availability: Loading
47. One-dimensional simulation of stratification and dissolved oxygen in McCook Reservoir, Illinois Author/Creator: Robertson, Dale M. Publication/Creation: Middleton, Wis. : U.S. Dept. of the Interior, U.S. Geological Survey, 2000 Resource Type: Book Access & Availability: Loading
48. One-dimensional transport with inflow and storage (OTIS) : a solute transport model for streams and rivers Author/Creator: Runkel, Robert L., author Publication/Creation: Denver, Colorado : U.S. Geological Survey, 1998 Resource Type: Book Access & Availability: Loading
49. Optimization of ground-water withdrawal at the old O-Field area, Aberdeen Proving Ground, Maryland Author/Creator: Banks, William S. L. Publication/Creation: Baltimore, Md. : U.S. Dept. of the Interior, U.S. Geological Survey, 2001 Resource Type: Book Access & Availability: Loading
50. An optimized network for phosphorus load monitoring for Lake Okeechobee, Florida Author/Creator: Gain, W. Scott, author Publication/Creation: Tallahassee, Florida : U.S. Geological Survey, 1997 Resource Type: Book Access & Availability: Loading