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    • Sij, J.; Morgan, C.; Belew, M.; Jones, D.; Wagner, K. (Texas Water Resources Institute, 2008-10)
      The Seymour Aquifer is a shallow aquifer underlying over 300,000 acres in 20 counties in northwest central Texas. High nitrate concentrations are widespread in the Seymour Aquifer. Median nitrate levels in Knox, Haskell, ...