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Nakagaki, Naomi, Hitt, K.J., Price, C.V., and Falcone, J.A., 2012, Methods to characterize environmental settings of stream and groundwater sampling sites for National Water-Quality Assessment: U.S. Geological Survey Scientific Investigations Report 2012?5194, 56 p. Available Online

Wieczorek, M.E., Nakagaki, N., and Falcone, J.A., 2011, Archiving and maintaining consistent watershed boundaries (abstract), from Proceedings: U.S. Geological Survey Eighth Biennial Geographic Information Science Workshop and the First National Map Users Conference, Denver, Colorado, May 10-13, 2011, U.S. Geological Survey Scientific Investigations Report 2011-5053, 41 p.

Toccalino, P.L, Norman, J.E., and Scott, J.C., 2011, Chemical mixtures in water from public-supply wells in the U.S.?occurrence, composition, and relative toxicity. International Toxicology of Mixtures Conference, Arlington, VA, October 21?23, 2011. Poster P2.27 Available Online

Price, C.V., Nakagaki, N., 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 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 Data Series 240 Available Online

Nakagaki, Naomi, and Wolock, D.M., 2005, Estimation of agricultural pesticide use in drainage basins using land cover maps and county pesticide data: U.S. Geological Survey Open-File Report 2005-1188, 46 p. Available Online

Thelin, G.P., Gianessi, L.P., 2000, OFR 00-250 Method for Estimating Pesticide Use for County Areas of the Conterminous United States. U.S. Geological Survey Open-File Report 00-250, 62 p. Available Online

Gilliom, Robert J.; Thelin, Gail P., 1997 Classification and mapping of agricultural land for National Water-Quality Assessment: U.S. Geological Survey Circular 1131, Available Online

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