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035   $a(OCoLC)896810485
035   $a(OCoLC)995470000002459098
035   $a(EXLCZ)995470000002459098
100   $a20141123d1976      ua             0
101 0 $aeng
135   $aurmn|||||||||
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 10$aPaleozoic origin of the cycads /$fby Sergius H. Mamay
210  1$aWashington :$cUnited States Department of the Interior, Geological Survey,$d1976.
215   $a1 online resource (iii, 48 pages, 5 unnumbered pages of plates) $cillustrations
225 1 $aGeological Survey professional paper ;$v934
300   $aTitle from title screen (viewed October 6, 2014).
300   $a"Megasporophylls and associated plant parts from the Upper Pennsylvanian and Lower Permian rocks of the southwestern United States are interpreted as a lineage of cycads, derived from the pteridosperms. Cycadean foliage is thought to be derived from Paleozoic taeniopterids."
320   $aIncludes bibliographical references (pages 44-46) and index.
606   $aCycads, Fossil
606   $aPaleobotany$yPaleozoic
606   $aPaleobotany$zWest (U.S.)
606   $aCycads, Fossil$2fast
606   $aPaleobotany$2fast
606   $aPaleozoic Geologic Period$2fast
607   $aSouthwest, New$2fast
615  0$aCycads, Fossil.
615  0$aPaleobotany
615  0$aPaleobotany
615  7$aCycads, Fossil.
615  7$aPaleobotany.
615  7$aPaleozoic Geologic Period.
700   $aMamay$b Sergius H.$f1920-$01386004
712 02$aGeological Survey (U.S.),
801  0$bCOP
801  1$bCOP
801  2$bOCLCO
801  2$bOCLCF
801  2$bGPO
906   $aBOOK
912   $a9910706837103321
996   $aPaleozoic origin of the cycads$93511959
997   $aUNINA