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Bondelid, T., S. Unger, and A. Stoddard. 2000. National water pollution control assessment model (NWPCAM) Version 1.1. Final report prepared by Research Triangle Institute, Research Triangle Park, NC for U.S. Environmental Protection Agency, Office of Policy, Economics and Innovation, Washington, DC, November, RTI Project Number 92U-7640-031.

Chapra, S. C. 1997. Surface water quality modeling. McGraw-Hill, New York. 844 pp.

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Smith, R. A., R. B. Alexander, and M. G. Wolman. 1987a. Analysis and interpretation of water quality trends in major U. S. rivers, 1974-81. Water-Supply Paper 2307. U. S. Geological Survey, Reston, VA.

Smith, R. A., R. B. Alexander, and M. G. Wolman. 1987b. Water quality trends in the nation's rivers. Science 235 (27 March): 1607-1615.

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