USGS Washington Water Science Center
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Frans, L.M., Paulson, A., Richerson, P., Striz, E., and Black,C., 2005, Stable Isotopes of Nitrogen and Oxygen in Source Identificaiton of Nitrate in Ground Water Near Umatilla, Oregon [poster]: Groundwater Under the Pacific Northwest--Integrating Research, Policy, and Education--2005, Stevenson, Washington, November 2-3, 2005 (PDF, 491 KB)
Frans, Lonna, Paulson, Anthony, Richerson, Phil, Striz, Elise, and Black, Curt, 2009, Evaluation of sources of nitrate beneath food processing wastewater-application sites near Umatilla, Oregon: U.S. Geological Survey Scientific Investigations Report 2009-5069, 14 p.
Paulson, Anthony, 2003, Outline of Study to Determine the Isotopic Signatures of Nitrate in Ground Water of the Umatilla Basin: Presentation by the U.S. Geological Survey at the Washington Water Science Center, Tacoma, WA, November 4, 2003, (PDF, 484 KB)