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100   $a20090403d2008      ua             0
101 0 $aeng
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181   $ctxt$2rdacontent
182   $cc$2rdamedia
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200 10$aHydrologic drought of water year 2006 compared with four major drought periods of the 20th century in Oklahoma$b[electronic resource] /$fby Robert L. Tortorelli ; prepared in cooperation with the Oklahoma Water Resources Board
210  1$aReston, Va. :$cU.S. Geological Survey,$d2008.
215   $a1 online resource (vi, 46 pages) $cdigital, PDF file
225 1 $aScientific investigations report ;$v2008-5199
300   $aTitle from title screen (viewed Mar. 15, 2010).
320   $aIncludes bibliographical references (pages 36-38).
606   $aDroughts$zOklahoma$xHistory
615  0$aDroughts$xHistory.
700   $aTortorelli$b Robert L$01388659
712 02$aOklahoma Water Resources Board.
712 02$aGeological Survey (U.S.)
801  0$bOKD
801  1$bOKD
801  2$bOKU
801  2$bGPO
906   $aBOOK
912   $a9910699045003321
996   $aHydrologic drought of water year 2006 compared with four major drought periods of the 20th century in Oklahoma$93471656
997   $aUNINA