1. Observations of environmental change in Grand Canyon, Arizona Author/Creator: Webb, Robert H. Publication/Creation: U.S. Geological Survey, Information Services [distributor]. Resource Type: 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 Resource Type: 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 Resource Type: 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 Resource Type: 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 Resource Type: 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 Resource Type: 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]. Resource Type: 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 Resource Type: 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 Resource Type: 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 Resource Type: 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] Resource Type: 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 Resource Type: 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]. Resource Type: 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 Resource Type: 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]. Resource Type: 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]. Resource Type: 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 Resource Type: 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 Resource Type: 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 Resource Type: 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 Resource Type: Book Access & Availability: Loading