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181   $ctxt$2rdacontent
182   $cc$2rdamedia
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200 10$aData requirements for modeling a ground-water system in an arid region /$fby Fred Kunkel
210  1$aMenlo Park, Calif. :$cU.S. Geological Survey,$d1973.
215   $a1 online resource (iii, 21 pages) $cillustrations, maps
225 1 $aWater-resources investigations ;$v4-73
300   $a"March 1973."
320   $aIncludes bibliographical references (page 21).
606   $aHydrogeological modeling$zUnited States
606   $aGroundwater$zUnited States$xMathematical models
606   $aArid regions$zUnited States
615  0$aHydrogeological modeling
615  0$aGroundwater$xMathematical models.
615  0$aArid regions
700   $aKunkel$b Fred$f1918-$01397372
712 02$aGeological Survey (U.S.),
712 02$aGeological Survey (U.S.).$bWater Resources Division.
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996   $aData requirements for modeling a ground-water system in an arid region$93525438
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