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102   $aGB
105   $aa       101yy
200 1 $aHeterocycles in bio-organic chemistry$fedited by J. Bergman, Henrik Cornelis van der Plas, Miklos Simonyi.
210   $aCambridge$cThe Royal Society of Chemistry$d1991
215   $aVIII, 239 p.$d24 cm
610 0 $aComposti eterociclici
676   $a547.59$v22$zita
702  1$aBergman,$bJ.
702  1$aSimonyi,$bMiklos
702  1$aVan Der plas,$bHenrik Cornelis
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181   $ctxt$2rdacontent
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200 10$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.
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