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McMahon, Gerard, Gregonis, Steven M., Waltman, Sharon W., Omernik, James M., Thorson, Thor D., Freeouf, Jerry A., Rorick, Andrew H., and Keys, James E., 2001, Developing a spatial framework of common ecological regions for the conterminous United States: Environmental Management, vol. 28, no. 3, p. 293-316.  Available Online

Stribling, J.B., Moulton II, S.R., and Lester, G.T., 2003, Determining the quality of taxonomic data: North American Benthological Society, vol. 22, p. 621-631  Available Online

Panshin, Sandra Y., 1997, Determining concentrations of 2-bromoallyl alcohol and dibromopropene in ground water using quantitative methods: U.S. Geological Survey Open-File Report 97-43, 7 p.  Available Online

Pankow, James F., Luo, Wentai, Isabelle, Lorne M., Bender, David A., and Baker, Ronald J., 1998, Determination of wide range of volatile organic compounds (VOCs) in ambient air using multisorbent adsorption/thermal desorption (ATD) and gas chromatography/mass spectrometry (GC/MS): Analytical Chemistry, vol. 70, no. 24, p. 5213-5221.  Available Online

Kratzer, Charles R., and Biagtan, Rhodora N., 1997, Determination of traveltimes in the Lower San Joaquin River Basin, California, from dye-tracer studies during 1994-1995: U.S. Geological Survey Water-Resources Investigations Report 97-4018, 20 p.  Available Online

Carter, Donna S., 1996, Determination of atrazine and its major degradation products in soil pore water by solid-phase extraction, chemical derivation, and gas chromatography/mass spectrometry: U.S. Geological Survey Open-File Report 96-459, 12 p.  Available Online

Thiros, S.A., Bender, D.A., Mueller, D.K., Rose, D.L., Olsen, L.D., Martin, J.D., Bernard, B., and Zogorski J.S., 2011, Design and evaluation of a field study on the contamination of selected volatile organic compounds and wastewater-indicator compounds in blanks and groundwater samples: U.S. Geological Survey Scientific Investigations Report 2011-5027, 85 p.  Available Online

Wolock, D.M., Winter, T.C., and McMahon, G., 2004, Delineation and evaluation of hydrologic-landscape regions in the United States using geographic information system tools and multivariate statistical analyses: Environmental Management, vol. 34 (Supplement 1), p. S71-S88.  doi: 10.1007/s00267-003-5077-9 Available Online

Chappell, F.H., McMahon, P.B., Dubrovsky, N.M, Fujii, R.F., Oaksford,E.T., and Vroblesky, D.A., 1995, Deducing the distribution of terminal electron-accepting processes in hydrologically diverse groundwater systems: Water Resources Research, vol. 31, no. 2, p. 359-371.  Available Online

Bell, R.W., and Williamson, A.K., 2006, Data delivery and mapping over the Web-National Water-Quality Assessment Data Warehouse: U.S. Geological Survey Fact Sheet 2006-3101, 6 p.  Available Online

Rees, Julie A.H., 1999, Converting contour-line data into data sets for a multilayered aquifer using a geographic information system: U.S. Geological Survey Open-File Report 99-54, 29 p.  Available Online

Mahler, B.J., Van Metre, P.C., Wilson, J.T., Guilfoyle, A.L., and Sunvison, M.W., 2006, Concentrations, loads, and yields of particle-associated contaminants in urban creeks, Austin, Texas, 1999-2004: U.S. Geological Survey Scientific Investigations Report 2006-5262, 107 p.  Available Online

Scott, J.C., 1990, Computerized stratified random site-selection approaches for design of a ground-water-quality sampling network: U.S. Geological Survey Water-Resources Investigations Report 90-4101, 109 p.  Available Online

Scott, J.C., 1991, Computer software for converting ground-water and water-quality data from the National Water Information System for use in a geographic information system: U.S. Geological Survey Water-Resources Investigations Report 90-4200, 55 p.  Available Online

Lorenz, D.L., Goldstein, R.M., Cowdery, T.K., and Stoner, J.D., 2003, Comparison of two methods for delineating land use near monitoring wells used for assessing quality of shallow ground water: U.S. Geological Survey Water-Resources Investigations Report 03-4067, 13 p.  Available Online

Peterson, David A., and Zumberge, Jeremy R., 2006, Comparison of Macroinvertebrate Community Structure between Two Riffle-Based Sampling Protocols in Wyoming, Colorado, and Montana, 2000-2001: U.S. Geological Survey Scientific Investigations Report 2006-5117, 12 p.  Available Online

Lydy, M.J., Carter, D.S., and Crawford, C.G., 1996, Comparison of gas chromatography/mass spectrometry and immunoassay techniques on concentrations of atrazine in storm runoff: Archives of Environmental Contamination and Toxicology, vol. 31, no. 3, p. 378-385.  doi: 10.1007/BF00212676 Available Online

Bastian, K.Chad, Thurman, E.M., Kleiss, and Rebich, Richard A., 1998, Comparison of enzyme-linked immunoassay with gas chromatography/mass spectrometry for analysis of the cotton herbicide fluometuron: Proceedings of the 28th Mississippi Water Resources Conference, April 7-8 1998, Raymond, MS, p. 45-55. 

Lenz, Bernard N., and Miller, Michael A., 1996, Comparison of aquatic macroinvertebrate samples collected using different field methods: U.S. Geological Survey Fact Sheet 216-96, 4 p.  Available Online

Stewart, Jana S., 1998, Combining satellite data with ancillary data to produce a refined land-use/land-cover map: U.S. Geological Survey Water-Resources Investigations Report 97-4203, 11 p.  Available Online

Coes, Alissa, Gellenbeck, Dorinda, and Towne, Doug, 1997, Collection and analysis of ground-water samples in the Sierra vista Basin, Arizona, 1996: U.S. Geological Survey Fact Sheet FS-107-97, 2 p.  Available Online

Qi, Sharon L., Konduris, Alexandria, Litke, David W., and Dupree, Jean, 2002, Classification of irrigated land using satellite imagery--High Plains aquifer, nominal date 1992: U.S. Geological Survey Water-Resources Investigations Report 02-4236, 31 p.  Available Online

Gilliom, Robert J., and Thelin, Gail P., 1997, Classification and mapping of agricultural land for national water-quality assessment: U.S. Geological Survey Circular 1131, 70 p.  Available Online

Potapova, M.G., and Charles, D.F., 2005, Choice of substrate in algae-based water-quality assessment: Journal of the North American Benthological Society, vol. 24, no. 2, p. 415-427.  Available Online

Dunkle, S.A., Plummer, L.N., Busenberg, E., Phillips, P.J., Denver, J.M., Hamilton, P.A., Michel, R.L., and Coplen, T.B., 1993, Chlorofluoro-carbons (CC13F and CC12F2) as dating tools and hydrologic tracers in shallow groundwater of the Delmarva Peninsula, Atlantic Coastal Plain, United States: Water Resources Research, vol. 29, no. 12, p. 3837-3860.  Available Online

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