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100   $a20140802d1964      ua             0
101 0 $aeng
135   $aurn||||||||||
181   $ccri$2rdacontent
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 14$aThe Helderberg Group and the position of the Silurian-Devonian boundary in North America /$fby Jean M. Berdan
210  1$aWashington, D.C. :$cUnited States Department of the Interior, Geological Survey,$d1964.
210  2$aWashington, D.C. :$cGovernment Printing Office.
215   $a1 online resource (iii, 19 pages) $cmap, charts
225 1 $aGeological Survey bulletin ;$v1180-B
300   $aTitle from title screen (viewed July 24, 2014).
300   $aAdditional title page description: "A historical summary including a review of pertinent literature."
320   $aIncludes bibliographical references (pages 18-19).
517 3 $aContributions to stratigraphic paleontology
606   $aGeology, Stratigraphic$yDevonian
606   $aGeology, Stratigraphic$ySilurian
615  0$aGeology, Stratigraphic
615  0$aGeology, Stratigraphic
700   $aBerdan$b Jean Milton$01392710
712 02$aGeological Survey (U.S.),
801  0$bCOP
801  1$bCOP
801  2$bOCLCO
801  2$bOCLCF
801  2$bGPO
906   $aBOOK
912   $a9910707858003321
996   $aThe Helderberg Group and the position of the Silurian-Devonian boundary in North America$93447867
997   $aUNINA