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Frans, L.M., 2005, Evaluating regional trends in ground-water nitrate concentrations of the Columbia Basin Groundwater Management Area, Washington [poster]: 5th Washington Hydrogeology Symposium, Tacoma, Washington, April 12-14, 2005. (PDF, 1.06 MB)
Frans, L.M., 2005, Evaluating regional trends in ground-water nitrate concentrations of the Columbia Basin Groundwater Management Area, Washington [abs]: 5th Washington Hydrogeology Symposium, Tacoma, Washington, April 12-14, 2005, Program, p. 81. (PDF, 2.13 MB)
Frans, L.M., 2000, Estimating the probability of elevated nitrate (NO2 + NO3 - N) concentrations in ground water in the Columbia Basin Ground Water Management Area, Washington: U.S. Geological Survey Water-Resources Investigations Report 00-4110, 24 p.
Frans, L.M., and Helsel, D.R., 2005, Evaluating regional trends in ground-water nitrate concentrations of the Columbia Basin Ground Water Management Area, Washington: U.S. Geological Survey Scientific Investigations Report 2005-5078, 7 p.
Tesoriero, A.J., Rupert, M.G., Frans, L.M., and Williamson, A.K., 2005, Logistic regression used to relate ground water quality to man-made and natural causes [abs.]: 5th Washington Hydrogeology Symposium, Tacoma, Washington, April 12-14, 2005, Program, p. 10. (PDF, 2.13 MB)
Tesoriero, A.J., Rupert, M.G., Frans, L.M., and Williamson, A.K., 2005, Logistic regression used to relate ground water quality to man-made and natural causes--Better than multiple regression: Presentation by the U.S. Geological Survey at the 5th Washington Hydrogeology Symposium, Tacoma, Washington, April 12-14, 2005, 25 p. (PDF, 1.69 MB)
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