1. Observations of environmental change in Grand Canyon, Arizona Author/Creator: Webb, Robert H. Publication/Creation: U.S. Geological Survey, Information Services [distributor]. Format: Book Access & Availability: Loading
2. Observed and predicted pier scour in Maine Author/Creator: Hodgkins, Glenn, author Publication/Creation: Augusta, Maine : U.S. Department of the Interior, U.S. Geological Survey, 2002 Format: Book Access & Availability: Loading
3. Observed and simulated distribution of selected herbicides in silty loam, sandy loam, and clay soil profiles near Topeka, Kansas, 1986-88 Author/Creator: Perry, Charles A., author Publication/Creation: Lawrence, Kansas : U.S. Geological Survey, 1991 Format: Book Access & Availability: Loading
4. An observed-streambed-scour index for selected bridges in southwestern Indiana, 1991 Author/Creator: Robinson, Bret A., author Publication/Creation: Indianapolis, Indiana : U.S. Geological Survey, 1995 Format: Book Access & Availability: Loading
5. Occurrence and availability of ground water in the Athens region, northeastern Georgia Author/Creator: Radtke, Dean B., author Publication/Creation: Doraville, Georgia : U.S. Geological Survey, 1986 Format: Book Access & Availability: Loading
6. Occurrence and distribution of dissolved pesticides in the San Joaquin River Basin, California Author/Creator: Panshin, Sandra Yvonne, 1967- author Publication/Creation: Sacramento, California : U.S. Geological Survey, 1998 Format: Book Access & Availability: Loading
7. Occurrence and distribution of dissolved trace elements in the surface waters of the Yakima River Basin, Washington Author/Creator: Hughes, Curt A. Publication/Creation: Denver, CO : U.S. Geological Survey, Branch of Information Services [distributor]. Format: Book Access & Availability: Loading
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 Author/Creator: Banks, William S. L., author Publication/Creation: Baltimore, Maryland : U.S. Department of the Interior, U.S. Geological Survey, 2001 Format: Book Access & Availability: Loading
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 Author/Creator: Grady, Stephen J., author Publication/Creation: East Hartford, Connecticut : U.S. Department of the Interior, U.S. Geological Survey, 2001 Format: Book Access & Availability: Loading
10. Occurrence and distribution of microbiological contamination and enteric viruses in shallow ground water in Baltimore and Harford counties, Maryland Author/Creator: Banks, William S. L. Publication/Creation: Baltimore, Md. : U.S. Dept. of the Interior, U.S. Geological Survey, 2002 Format: Book Access & Availability: Loading
11. Occurrence and distribution of microbiological contamination and enteric viruses in shallow ground water in Baltimore and Harford counties, Maryland Author/Creator: Banks, William S. L. Publication/Creation: Denver, CO : U.S. Geological Survey, Branch of Information Services [distributor] Format: Book Access & Availability: Loading
12. Occurrence and distribution of nitrate and herbicides in the Iowa River alluvial aquifer, Iowa--May 1984 to November 1985 Author/Creator: Detroy, Mark G., author Publication/Creation: Iowa City, Iowa : U.S. Geological Survey, 1988 Format: Book Access & Availability: Loading
13. Occurrence and distribution of nutrients, suspended sediment, and pesticides in the Mobile River basin, Alabama, Georgia, Mississippi, and Tennessee, 1999-2001 Author/Creator: McPherson, Ann K. Publication/Creation: Denver, CO : U.S. Geological Survey, Branch of Information Services [distributor]. Format: Book Access & Availability: Loading
14. Occurrence and distribution of organochlorine compounds in biological tissue and bed sediment from streams in the Trinity River basin, Texas, 1992-93 Author/Creator: Moring, J. Bruce 1959- (James Bruce), author Publication/Creation: Austin, Texas : U.S. Geological Survey, 1997 Format: Book Access & Availability: Loading
15. Occurrence and distribution of organochlorine pesticides, polychlorinated biphenyls, and trace elements in fish tissue in the lower Tennessee River Basin, 1980-98 Author/Creator: Knight, Rodney R. Publication/Creation: Denver, CO : U.S. Geological Survey, Branch of Information Services [distributor]. Format: Book Access & Availability: Loading
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 Author/Creator: Lietz, A. C. Publication/Creation: Denver, CO : U.S. Geological Survey, Branch of Information Services [distributor]. Format: Book Access & Availability: Loading
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 Author/Creator: Moran, Michael J. 1962- (Michael James) Publication/Creation: Rapid City, S.D. : U.S. Dept. of the Interior, U.S. Geological Survey, 2004 Format: Book Access & Availability: Loading
18. Occurrence and seasonal variability of volatile organic compounds in seven New Jersey streams Author/Creator: Reiser, Robert G., author Publication/Creation: [West Trenton, N.J. ?] : U.S. Department of the Interior, U.S. Geological Survey, 1998 Format: Book Access & Availability: Loading
19. Occurrence and status of volatile organic compounds in ground water from rural, untreated, self-supplied domestic wells in the United States, 1986-99 Publication/Creation: Rapid City, SD : U.S. Dept. of the Interior, U.S. Geological Survey, 2002 Format: Book Access & Availability: Loading
20. 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 Author/Creator: Delzer, Gregory C. Publication/Creation: Rapid City, S.D. : U.S. Dept. of the Interior, U.S. Geological Survey, 2003 Format: Book Access & Availability: Loading
21. Occurrence and transport of cadmium, lead, and zinc in the Spokane River basin, Idaho and Washington, water years 1999-2001 Author/Creator: Clark, G. M. 1958- (Gregory M.) Publication/Creation: Boise, Idaho : U.S. Dept. of the Interior, U.S. Geological Survey, 2003 Format: Book Access & Availability: Loading
22. Occurrence and transport of diazinon in the Sacramento River, and selected tributaries, California, during two winter storms, January-February 2001 Publication/Creation: Sacramento, Calif. : U.S. Dept. of the Interior, U.S. Geological Survey, 2003 Format: Book Access & Availability: Loading
23. Occurrence, distribution, and loads of selected pesticides in streams in the Lake Erie-Lake St. Clair Basin, 1996-98 Author/Creator: Frey, Jeffrey W. Publication/Creation: Indianapolis, Ind. : U.S. Dept. of the Interior, U.S. Geological Survey, 2001 Format: Book Access & Availability: Loading
24. Occurrence, distribution, and loads of selected pesticides in streams in the Lake Erie-Lake St. Clair Basin, 1996-98 Author/Creator: Frey, Jeffrey W., author Publication/Creation: Indianapolis, Indiana : U.S. Department of the Interior, U.S. Geological Survey, 2001 Format: Book Access & Availability: Loading
25. Occurrence, distribution, and trends of volatile organic compounds in the Ohio River and its major tributaries, 1987-96 Author/Creator: Lundgren, Robert F., author Publication/Creation: Rapid City, South Dakota : U.S. Department of the Interior, U.S. Geological Survey, 1999 Format: Book Access & Availability: Loading
26. Occurrence of and trends in selected sediment-associated contaminants in Caddo Lake, East Texas, 1940-2002 Author/Creator: Wilson, Jennifer T., 1973- Publication/Creation: Denver, CO : U.S. Geological Survey, Information Services [distributor]. Format: Book Access & Availability: Loading
27. Occurrence of arsenic in ground water of Suffolk County, New York, 1997-2002 Author/Creator: Cartwright, Richard A. Publication/Creation: Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2004 Format: Book Access & Availability: Loading
28. Occurrence of beds of low hydraulic conductivity in surficial deposits of Florida Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Denver Colorado : Open-File Services Section, Western Distribution Branch, U.S. Geological Survey Format: Map Access & Availability: Loading
29. Occurrence of dissolved sodium in ground waters in basalts underlying the Columbia Plateau, Washington Author/Creator: Bortleson, Gilbert Carl, 1940- author Publication/Creation: Tacoma, Washington : U.S. Geological Survey, 1986 Format: Book Access & Availability: Loading
30. Occurrence of dissolved solids, nutrients, atrazine, and fecal coliform bacteria during low flow in the Cheney Reservoir Watershed, south-central Kansas, 1996 Author/Creator: Christensen, Victoria G., author Publication/Creation: Lawrence, Kansas : U.S. Geological Survey, 1997 Format: Book Access & Availability: Loading
31. Occurrence of fecal coliform bacteria in selected streams in Wyoming, 1990-99 Author/Creator: Clark, Melanie L., author Publication/Creation: Cheyenne, Wyoming : U.S. Department of the Interior, U.S. Geological Survey, 2000 Format: Book Access & Availability: Loading
32. Occurrence of natural radium-226 radioactivity in ground water of Sarasota County, Florida Author/Creator: Miller, Ronald L. (Ronald Lewis), author Publication/Creation: Tallahassee, Florida : U.S. Geological Survey, 1985 Format: Book Access & Availability: Loading
33. Occurrence of nitrate and pesticides in ground water beneath three agricultural land-use settings in the eastern San Joaquin Valley, California, 1993-1995 Author/Creator: Burow, Karen R., author Publication/Creation: Sacramento, California : U.S. Geological Survey, 1998 Format: Book Access & Availability: Loading
34. Occurrence of nitrate, pesticides, and volatile organic compounds in the Kirkwood-Cohansey Aquifer system, southern New Jersey Author/Creator: Stackelberg, Paul E., author Publication/Creation: West Trenton, New Jersey : U.S. Department of the Interior, U.S. Geological Survey, 1997 Format: Book Access & Availability: Loading
35. Occurrence of pesticides in streams and ground water in the Puget Sound Basin, Washington, and British Columbia, 1996-98 Author/Creator: Bortleson, Gilbert Carl, 1940- author Publication/Creation: Tacoma, Washington : U.S. Department of the Interior, U.S. Geological Survey, 2000 Format: Book Access & Availability: Loading
36. Occurrence of phosphorus, nitrate, and suspended solids in streams of the Cheney Reservoir Watershed, south-central Kansas, 1997-2000 Author/Creator: Milligan, Chad R. Publication/Creation: Lawrence, Kan. : U.S. Dept. of the Interior, U.S. Geological Survey, 2001 Format: Book Access & Availability: Loading
37. Occurrence of phosphorus, other nutrients, and triazine herbicides in water from the Hillsdale Lake Basin, Northeast Kansas, May 1994 through May 1995 Author/Creator: Putnam, James E., author Publication/Creation: Lawrence, Kansas : U.S. Geological Survey, 1997 Format: Book Access & Availability: Loading
38. Occurrence of saltwater in the alluvial aquifer in the Boeuf-Tensas Basin, Arkansas Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Denver Colorado : Open-File Services Section, Western Distribution Branch, U.S. Geological Survey Format: Map Access & Availability: Loading
39. 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 Format: Book Access & Availability: Loading
40. 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 Format: Book Access & Availability: Loading
41. 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 Format: Book Access & Availability: Loading
42. 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 Format: Book Access & Availability: Loading
43. 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] Format: Book Access & Availability: Loading
44. 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]. Format: Book Access & Availability: Loading
45. 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 Format: Book Access & Availability: Loading
46. 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 Format: Book Access & Availability: Loading
47. 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 Format: Book Access & Availability: Loading
48. 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 Format: Book Access & Availability: Loading
49. Organic and trace element contaminants in water, biota, sediment, and semipermeable membrane devices at the Tres Rios Treatment Wetlands, Phoenix, Arizona Publication/Creation: Denver, Colo. : U.S. Dept. of the Interior, U.S. Geological Survey, 2003 Format: Book Access & Availability: Loading
50. Organic carbon trends, loads, and yields to the Sacramento-San Joaquin Delta, California, water years 1980-2000 Publication/Creation: Sacramento, Calif. : U.S. Dept. of the Interior, U.S. Geological Survey, 2003 Format: Book Access & Availability: Loading