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Text File  |  1992-09-01  |  250b  |  7 lines
  1. The largest source of groundwater in the USA,
  2. stretching from southern South Dakota to NW
  3. Texas. The over-exploitation of this water
  4. resource has resulted in the loss of over 18%
  5. of the irrigated farmland of Oklahoma and
  6. Texas in the period 1940-90.
  7.