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100   $a20101213d2010      ua             0
101 0 $aeng
135   $aurcn|||||||||
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 10$aSources of groundwater based on helium analyses in and near the freshwater/saline-water transition zone of the San Antonio segment of the Edwards Aquifer, south-central Texas, 2002-03$b[electronic resource]$fby Andrew G. Hunt, Rebecca B. Lambert, and Lynne Fahlquist ; in cooperation with the San Antonio Water System
210  1$aReston, Va. :$cU.S. Dept., of the Interior, U.S. Geological Survey,$d2010.
215   $a1 online resource (iv, 15 pages) $ccolor illustrations, color maps
225 1 $aScientific investigations report ;$v2010-5030
300   $aTitle from PDF title screen (viewed on Dec. 13, 2010).
320   $aIncludes bibliographical references (pages 14-15).
410  0$aScientific investigations report ;$v2010-5030.
606   $aGroundwater$zTexas$zSan Antonio
607   $aEdwards Aquifer (Tex.)
615  0$aGroundwater
700   $aHunt$b Andrew G$01413923
701   $aLambert$b Rebecca B$01409345
701   $aFahlquist$b Lynne$f1959-$01382535
712 02$aSan Antonio Water System (Tex.)
712 02$aGeological Survey (U.S.)
801  0$bGPO
801  1$bGPO
801  2$bGPO
906   $aBOOK
912   $a9910699599703321
996   $aSources of groundwater based on helium analyses in and near the freshwater$93511594
997   $aUNINA