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100   $a20140926d1968      ua             0
101 0 $aeng
135   $aurmn|||||||||
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 10$aTertiary volcanic stratigraphy in the Powderhorn-Black Canyon region, Gunnison and Montrose Counties, Colorado $enomenclature, lithology, and stratigraphic relations of a sequence of ash-flow tuffs, flows, and breccia /$fby J.C. Olson, D.C. Hedlund, and W.R. Hansen
210  1$a[Washington, D.C.] :$cUnited States Department of the Interior, Geological Survey,$d1968.
210  2$aWashington :$cUnited States Government Printing Office.
215   $a1 online resource (iv, 29 pages, 1 page of plates) $cillustrations, maps (some color)
225 1 $aGeological Survey bulletin ;$v1251-C
225 1 $aContributions to general geology
300   $aTitle from title screen (viewed September 15, 2014).
320   $aIncludes bibliographical references (pages 28-29).
517   $aTertiary volcanic stratigraphy in the Powderhorn-Black Canyon region, Gunnison and Montrose Counties, Colorado 
606   $aGeology$zColorado
606   $aGeology, Stratigraphic$yTertiary
606   $aGeology$2fast
606   $aGeology, Stratigraphic$2fast
606   $aTertiary Geologic Period$2fast
607   $aColorado$2fast
615  0$aGeology
615  0$aGeology, Stratigraphic
615  7$aGeology.
615  7$aGeology, Stratigraphic.
615  7$aTertiary Geologic Period.
700   $aOlson$b J. C$g(Jerry Chipman),$f1917-2013,$01392464
702   $aHansen$b Wallace R.$f1920-
702   $aHedlund$b David Carl$f1924-
712 02$aGeological Survey (U.S.),
801  0$bCOP
801  1$bCOP
801  2$bOCLCO
801  2$bOCLCF
801  2$bGPO
906   $aBOOK
912   $a9910707297403321
996   $aTertiary volcanic stratigraphy in the Powderhorn-Black Canyon region, Gunnison and Montrose Counties, Colorado$93538592
997   $aUNINA