Sanmanee, Sirichai. Use of GIS to Identify and Delineate Areas of Fluoride, Sulfate, Chloride, and Nitrate Levels in the Woodbine Aquifer, North Central Texas, in the 1950s, 1960s, 1970s, 1980s, and 1990s. Denton, Texas. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc2869/. Accessed December 26, 2014.
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