Selected References

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Buell, G.R., and Grams, S.C., 1985, The hydrologic bench-mark program—A standard to evaluate time-series trends in selected water-quality constituents for streams in Georgia: U.S. Geological Survey Water-Resources Investigations Report 84–4318, 36 p.

Cassingham, K.M., and Terziotti, Silvia, 2006, Using the National Hydrography Dataset Plus for drainage area delineation and site matching, in Brakebill, J.W., Sieverling, J.B., and Chirico, P.G., eds., 2006, Proceedings of the U.S. Geological Survey Sixth Biennial Geographic Information Science Workshop, April 24–28, 2006, Denver, Colorado: U.S. Geological Survey Scientific Investigations Report 2006–5094, accessed December 1, 2008, at https://pubs.usgs.gov/sir/2006/5094/.

Cohn, T.A., 1988, Adjusted maximum likelihood estimation of the moments of lognormal populations from type I censored samples: U.S. Geological Survey Open-File Report 88–350, 34 p.

Cohn, T.A., Caulder, D.L., Gilroy, E.J., Zynjul, L.D., and Summers, R.M., 1992, The validity of a simple statistical model for estimating fluvial constituent loads; An empirical study involving nutrient loads entering Chesapeake Bay: Water Resources Research, v. 28, no. 9, p. 2353–2363.

Cohn, T.A., DeLong, L.L., Gilroy, E.J., Hirsch, R.M., and Wells, D.K., 1989, Estimating constituent loads: Water Resources Research, v. 25, no. 5, p. 937–942.

Falcone, J., Stewart, J., Sobieszczyk, S., Dupree, J., McMahon, G., and Buell, G., 2007, A comparison of natural and urban characteristics and the development of urban intensity indices across six geographic settings: U.S. Geological Survey Scientific Investigations Report 2007–5123, 45 p.

Fenneman, N.M., 1938, Physiography of Eastern United States: New York, McGraw-Hill, 691 p.

Gilliom, R.J., Hamilton, P.A., and Miller, T.L., 2001, The National Water-Quality Assessment Program—Entering a new decade of investigations: U.S. Geological Survey Fact Sheet 071–01, 6 p.

Gilroy, E.J., Hirsch, R.M., and Cohn, T.A., 1990; Mean square error of regression-based constituent transport estimates: Water Resources Research, v. 26, p. 2069.

Guimaraes, W.B., and Bohman, L.R., 1992, Techniques for estimating magnitude and frequency of floods in South Carolina, 1988: U.S. Geological Survey Water-Resources Investigations Report 91–4157, 174 p.

Hamilton, P.A., Miller T.L., and Myers, D.N., 2004, Water quality in the Nation’s streams and aquifers—Overview of selected findings, 1991–2001: U.S. Geological Survey Circular 1265, 28 p.

Heath, R.C., 1984, Ground-water regions of the United States: U.S. Geological Survey Water-Supply Paper 2242, 78 p.

Hooper, R.P., Goolsby, D.A., Rickert, D.A., and McKenzie, S.W., 1997, NASQAN—A program to monitor the water quality of the Nation's large rivers: U.S. Geological Survey Fact Sheet 055–97, 6 p.

Mueller, D.K., and Spahr, N.E., 2005, Water-quality, streamflow, and ancillary data for nutrients in streams and rivers across the Nation, 1992–2001: U.S. Geological Survey Data Series 152.

Oblinger, C.J., Foreman, W.T., Connor B.F., and Maloney, T.F., 1999, New reporting procedures based on long-term method-detection levels and some considerations for interpretations of water-quality data provided by the U.S. Geological Survey National Water Quality Laboratory: U.S. Geological Survey Open-File Report 99–193, 19 p.

Ruddy, B.C., Lorenz, D.L., and Mueller, D.K., 2006, County-level estimates of nutrient inputs to the land surface of the conterminous United States, 1982–2001: U.S. Geological Survey Scientific Investigations Report 2006–5012, 23 p.

Runkel, R.L., Crawford, C.G., and Cohn, T.A., 2004, Load Estimator (LOADEST)—A FORTRAN program for estimating constituent loads in streams and rivers: U.S. Geological Survey Techniques and Methods book 4, chap. A5, 69 p.

Schertz, T.L., Alexander, R.B., and Ohe, D.J., 1991, The computer program estimate trend (ESTREND), a system for the detection of trends in water-quality data: U.S. Geological Survey Water-Resources Investigations Report 91–4040, 68 p.

Seaber, P.R., Kapinos, F.P., and Knapp, G.L., 1987, Hydrologic units maps: U.S. Geological Survey Water-Supply Paper 2294, 63 p.

Slack, J.R., Lorenz, D.L., and others, 2003, USGS library for S-PLUS for Windows, Release 2: U.S. Geological Survey Open-File Report 2003–357, accessed in December 2007 at http://pubs.er.usgs.gov/usgspubs/ofr/ofr03357 [release 2.1 was available in January 2008 at http://water.usgs.gov/software/S-PLUS/].

Timme, P.J., 1995, National Water Quality Laboratory 1995 services catalog: U.S. Geological Survey Open-File Report 95–352, 120 p.

Trapp, H.H., Jr., and Horn, M.A., 1997, Ground-water atlas of the United States—Segment 11, Delaware, Maryland, New Jersey, North Carolina, Pennsylvania, Virginia, West Virginia: U.S. Geological Survey Hydrologic Atlas 730–L, 24 p.

U.S. Geological Survey, 2006, National Water-Quality Assessment (NAWQA) Program: U.S. Geological Survey Web interface, accessed December 23, 2009, at http://water.usgs.gov/nawqa/.

U.S. Geological Survey, 2007, USGS water data for the Nation: U.S. Geological Survey National Water Information System Web interface, accessed December 23, 2009, at http://waterdata.usgs.gov/nwis/.

U.S. Geological Survey, 2008, NASQAN National Stream Quality Accounting Network: U.S. Geological Survey National Stream Quality Accounting Network Web interface, accessed December 23, 2009, at http://water.usgs.gov/nasqan/.