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100   $a20140929d1950      ua             0
101 0 $aeng
135   $aurmn|||||||||
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 10$aCretaceous plants from southwestern Colorado /$fby Roland W. Brown
210  1$aWashington :$cUnited States Department of the Interior, Geological Survey,$d1950.
215   $a1 online resource (27 unnumbered pages) $cillustrations
225 1 $aGeological Survey professional paper ;$v221-D
225 1 $aShorter contributions to general geology ;$v1949
300   $aIncludes plates.
300   $aTitle from title screen (viewed September 29, 2014).
300   $a"A study of fossil plants useful in determining the probable boundary between the Lower and Upper Cretaceous deposits."
320   $aIncludes bibliographical references (pages 52-53) and index.
606   $aPaleobotany$yCretaceous
606   $aPaleobotany$zColorado
606   $aCretaceous Geologic Period$2fast
606   $aPaleobotany$2fast
607   $aColorado$2fast
615  0$aPaleobotany
615  0$aPaleobotany
615  7$aCretaceous Geologic Period.
615  7$aPaleobotany.
700   $aBrown$b Roland W$g(Roland Wilbur),$f1893-1961,$01389891
712 02$aGeological Survey (U.S.),
801  0$bCOP
801  1$bCOP
801  2$bOCLCO
801  2$bOCLCF
801  2$bOCLCQ
801  2$bOCLCA
801  2$bGPO
906   $aBOOK
912   $a9910706293903321
996   $aCretaceous plants from southwestern Colorado$93497572
997   $aUNINA