USGS Washington Water Science Center
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Frans, L.M., 2008, Distribution of elevated nitrate concentrations in ground water in Washington State: U.S. Geological Survey Fact Sheet 2008-3063, 4 p.
Frans, L.M., 2008, Distribution of elevated nitrate concentrations in ground water in Washington State [poster]: Washington State Public Health Association 15th Annual Joint Conference on Health, Yakima, Washington, October 6th, 2008 (PDF, 3 MB)
Frans, Lonna, 2008, Estimating the probability of elevated nitrate concentrations in ground water in Washington State: U.S. Geological Survey Scientific Investigations Report 2008-5025, 22 p.