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

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2014 2 4 3 1 1 1 10 22
2013 5 4 4 4 7 3 4 34 13 13 6 3 100
2012 4 4 4 6 4 1 2 1 0 5 0 6 37
2011 0 0 1 5 8 6 6 6 3 3 3 3 44
2010 2 0 3 0 1 1 2 1 0 0 0 0 10

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