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100   $a20140929d1957      ua             0
101 0 $aeng
135   $aurmn|||||||||
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 14$aThe Lower Ordovician gastropod Ceratopea /$fby Ellis L. Yochelson and Josiah Bridge
210  1$aWashington :$cUnited States Department of the Interior, Geological Survey,$d1957.
215   $a1 online resource (28 unnumbered pages, 4 pages of plates) $cillustrations
225 1 $aGeological Survey professional paper ;$v294-H
225 1 $aShorter contributions to general geology
300   $aTitle from title screen (viewed September 29, 2014).
300   $a"Ceratopea Ulrich is redescribed from both operculum and shell. Ranges and variations of the several species are discussed."
320   $aIncludes bibliographical references (pages 301-302) and index.
606   $aGastropoda$zNorth America
606   $aPaleontology$yOrdovician
606   $aPaleontology$zNorth America
606   $aGastropoda$2fast
606   $aOrdovician Geologic Period$2fast
606   $aPaleontology$2fast
607   $aNorth America$2fast
615  0$aGastropoda
615  0$aPaleontology
615  0$aPaleontology
615  7$aGastropoda.
615  7$aOrdovician Geologic Period.
615  7$aPaleontology.
700   $aYochelson$b Ellis L$g(Ellis Leon),$f1928-2006,$01389960
702   $aBridge$b Josiah$f1890-1953,
712 02$aGeological Survey (U.S.),
801  0$bCOP
801  1$bCOP
801  2$bOCLCO
801  2$bOCLCF
801  2$bGPO
906   $aBOOK
912   $a9910706140903321
996   $aThe Lower Ordovician gastropod Ceratopea$93446808
997   $aUNINA