National Water-Quality Assessment (NAWQA) Program

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Puckett, Larry J., 1994, Nonpoint and point sources of nitrogen in major watersheds of the United States: U.S. Geological Survey Water-Resources Investigations Report 94-4001, 9 p.  Available Online

Puckett, L.J., Zamora, C., Essaid, H., Wilson, J.T., Johnson, H.M., Brayton, M.J., and Vogel, J.R., 2008, Transport and Fate of Nitrate at the Ground-Water/Surface-Water Interface: Journal of Environmental Quality, vol. 37, p. 1034-1050.  doi: 10.2134/jeq2006.0550 Available Online

Puckett, L.J., 2004, Hydrogeologic controls on the transport and fate of nitrate in ground water beneath riparian buffer zones: results from thirteen studies across the United States: Water Science and Technology, vol. 49, no. 3, p. 47-53.  doi: 10.2134/jeq2005.0109 Available Online

Price, C.V., Nakagaki, Naomi, and Hitt, K.J., 2010, National Water-Quality Assessment (NAWQA) Area-Characterization Toolbox, Release 1.0: U.S. Geological Survey Open-File Report 2010-1268, online-only.  Available Online

Price, C.V., Nakagaki, N., Hitt, K.J., and Clawges, R.M., 2003, Mining GIRAS: Improving on a national treasure of land-use data: Proceedings: ESRI 2003 International User Conference, San Diego, CA, July 7-11, 2003, on-line conference proceedings.  Available Online

Price, C.V., Nakagaki, N., Hitt, K.J., and Clawges, R.M., 2007, Enhanced Historical Land-Use and Land-Cover Data Sets of the U.S. Geological Survey: U.S. Geological Survey Digital Data Series, DDS-240, on-line only.  Available Online

Price, C.V., and Clawges, R.M., 1999, Digital data sets describing water use, toxic chemical releases, metropolitan areas, and population density of the conterminous United States: U.S. Geological Survey Open-File Report 99-78, illus., 13 refs.  Available Online

Preston, Stephen D., Alexander, Richard B., Woodside, Michael D., and Hamilton, Pixie A., 2009, SPARROW modeling - Enhancing understanding of the Nation's water quality: U.S. Geological Survey Fact Sheet 2009-3019, 6 p.  Available Online

Preston, S.D., Alexander, R.B., Schwarz, G.E., and Crawford, C.G., 2011, Factors affecting stream nutrient loads: A synthesis of regional SPARROW model results for the continental United States: Journal of the American Water Resources Association, online 22Aug2011 in advance of print, 25 p.  doi: 10.1111/j.1752-1688.2011.00577.x Available Online

Preston, S.D., Alexander, R.B., and Woodside, M.D., 2011, Regional assessments of the Nation's water quality--Improved understanding of stream nutrient sources through enhanced modeling capabilities: U.S. Geological Survey Fact Sheet 2011-3114, 6 p.  Available Online

Preston, S.D., Alexander, R.B., and Wolock, D.M., 2011, SPARROW modeling to understand water-quality conditions in major regions of the United States: A featured collection introduction: Journal of the American Water Resources Association, online 22Aug2011, 4 p.  doi: 10.1111/j.1752-1688.2011.00585.x Available Online

Potapova, Marina, Coles, J. F., Giddings, E.M., and Zappia, Humbert, 2005, A comparison of the influences of urbanization on stream benthic algal assemblages in contrasting environmental settings: in Brown, L.R., Gray, R.H., Hughes, R.M., and Meador, M.R., eds., Effects of urbanization on stream ecosystems: American Fisheries Society, Symposium 47, Bethesda, Maryland, p. 333-359.  Available Online

Potapova, Marina, and Carlisle, D.M., 2011, Development and application of indices to assess the condition of benthic algal communities in U.S. streams and rivers: U.S. Geological Survey Open File Report 2011-1126, 40 p.  Available Online

Potapova, M.G., Charles, D.F., Ponader, K.C., and Winter, D.M., 2007, Diatom metrics for monitoring eutrophication in rivers of the United States: Ecological Indicators, vol. 7, no. 1, p. 48-70.  doi: 10.1016/j.ecolind.2005.10.001 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

Potapova, M.G., and Charles, D.F., 2002, Benthic diatoms in USA rivers: distributions along spatial and environmental gradients: Journal of Biogeography, vol. 29, p. 167-187.  doi: 10.1046/j.1365-2699.2002.00668.x Available Online

Potapova, M.G. and Charles, D.F., 2003, Distribution of benthic diatoms in U.S. rivers in relation to conductivity and ionic composition: Freshwater Biology, vol. 48, p. 1311-1328.  doi: 10.1046/j.1365-2427.2003.01080.x Available Online

Potapova, M., and Charles, D.F., 2003, Potential use of rare diatoms as environmental indicators in U.S.A. rivers: Proceedings of the 17th International Diatom Symposium, Michel Poulin, Editor. Biopress Ltd., Bristol U.K., p. 281-295.  Available Online

Porter, Stephen D., Mueller, David K., Spahr, Norman E., Munn, Mark D., and Dubrovsky, Neil M., 2008, Efficacy of algal metrics for assessing nutrient and organic enrichment in flowing waters: Freshwater Biology, vol. 53, p. 1036-1054.  doi: 10.1111/j.1365-2427.2007.01951.x Available Online

Porter, Stephen D., 2008, Algal Attributes: An Autecological Classification of Algal Taxa Collected by the National Water-Quality Assessment Program: U.S. Geological Survey Data Series 329, 18 p.  Available Online

Plummer, L.N., Busenberg, E., Eberts, S.M., Bexfield, L.M., Brown, C.J., Fahlquist, L.S., Katz, B.G., and Landon, M.K., 2008, Low-level detections of halogenated volatile organic compounds in groundwater: Use in vulnerability assessments: Journal of Hydrologic Engineering, vol. 13, no. 11, November 2008, p. 1049-1068.  doi: 10.1061/(ASCE)1084-0699(2008)13:11(1049) Available Online

Phillips, S.P., Burow, K.R., Rewis, D.L., Shelton, J.J., and Jurgens, Bryant, 2007, Hydrogeologic setting and ground-water flow simulations of the San Joaquin Valley Regional Study Area, California, Section 4 in Paschke, Suzanne S., ed., 2007, Hydrogeologic settings and ground-water flow simulations for regional studies of the transport of anthropogenic and natural contaminants to public-supply wells--studies begun in 2001: U.S. Geological Survey Professional Paper 1737-A, p. 4-1 to 4-30.  Available Online

Phillips, P.J., Nowell, L.H., Gilliom, R.J., Nakagaki, N., Murray, K.R., and VanAlstyne, C., 2010, Composition, distribution, and potential toxicity of organochlorine mixtures in bed sediments of streams: Science of the Total Environment, vol. 408, p. 594-606.  doi: 10.1016/j.scitotenv.2009.09.052 Available Online

Phillips, P.J., Ator, S.W., and Nystrom, E.A., 2007, Temporal Changes in Surface-Water Insecticide Concentrations after the Phaseout of Diazinon and Chlorpyrifos: Environmental Science and Technology, vol. 41, no. 12, p. 4246-4251.  doi: 10.1021/es070301 Available Online

Paul, A.P., Paretti, N.V., MacCoy, D.E., and Brasher, A.M.D., 2012, The occurrence of trace elements in bed sediment collected from areas of varying land use and potential effects on stream macroinvertebrates in the conterminous western United States, Alaska, and Hawaii, 1992-2000: U.S. Geological Survey Scientific Investigations Report 2012-5272, 55 p.  Available Online

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