Steven W. Coffey Stone, K. C., Hunt, P. G., Johnson, M. H., & Coffey, S. W. (1998). GLEAMS simulation of groundwater nitrate-N from row crop and swine wastewater spray fields in the eastern coastal plain. Transactions of the ASAE, 41(1), 51–57. https://doi.org/10.13031/2013.17156 Line, D. E., Osmond, D. L., Coffey, S. W., McLaughlin, R. A., Jennings, G. D., Gale, J. A., & Spooner, J. (1997). [Review of Nonpoint sources]. WATER ENVIRONMENT RESEARCH, 69(4), 844–860. https://doi.org/10.2175/106143097X135055 Line, D. E., Coffey, S. W., & Osmond, D. (1997). WATERSHEDSS grass-AGNPS model tool. Transactions of the ASAE, 40(4), 971–975. https://doi.org/10.13031/2013.21348 Osmond, D. L., Gannon, R. W., Gale, J. A., Line, D. E., Knott, C. B., Phillips, K. A., … Spooner, J. (1997). WATERSHEDSS: A decision support system for watershed-scale nonpoint source water quality problems. JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION, 33(2), 327–341. https://doi.org/10.1111/j.1752-1688.1997.tb03513.x