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001 9910692118103321
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035   $a(EXLCZ)995470000002352257
100   $a20040131d2002      ua             0
101 0 $aeng
135   $aurgn||||||
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 10$aObservations of environmental change in Grand Canyon, Arizona$b[electronic resource] /$fby Robert H. Webb, Theodore S. Melis, and Richard A. Valdez ; prepared in cooperation with Grand Canyon Monitoring and Research Center
210  1$aTucson, Ariz. :$cU.S. Geological Survey ; Denver, CO :$cU.S. Geological Survey, Information Services [distributor],$d2002.
225 1 $aWater-resources investigations report ;$v02-4080
300   $aTitle from title screen (viewed on Jan. 31, 2004).
320   $aIncludes bibliographic references.
607   $aGrand Canyon (Ariz.)$xEnvironmental conditions$xHistory
700   $aWebb$b Robert H$0123725
701   $aMelis$b Theodore S$01381361
701   $aValdez$b Richard A$01381362
712 02$aGrand Canyon Monitoring and Research Center.
712 02$aGeological Survey (U.S.)
801  0$bGPO
801  1$bGPO
906   $aBOOK
912   $a9910692118103321
996   $aObservations of environmental change in Grand Canyon, Arizona$93423903
997   $aUNINA