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[null,"1.","Record Nr.",null,"UNINA9910706837103321"]
[null,null,"Autore",null,"Mamay Sergius H. <1920->"]
[null,null,"Titolo",null,"Paleozoic origin of the cycads / / by Sergius H. Mamay"]
[null,null,"Pubbl/distr/stampa",null,"Washington : , : United States Department of the Interior, Geological Survey, , 1976"]
[null,null,"Descrizione fisica",null,"1 online resource (iii, 48 pages, 5 unnumbered pages of plates) : illustrations"]
[null,null,"Collana",null,"Geological Survey professional paper ; ; 934"]
[null,null,"Soggetti",null,"Cycads, Fossil"]
[{"$nulls":4},"Paleobotany - Paleozoic"]
[{"$nulls":4},"Paleobotany - West (U.S.)"]
[{"$nulls":4},"Paleobotany"]
[{"$nulls":4},"Paleozoic Geologic Period"]
[{"$nulls":4},"Southwest, New"]
[null,null,"Lingua di pubblicazione",null,"Inglese"]
[null,null,"Formato",null,"Materiale a stampa"]
[null,null,null,"Livello bibliografico","Monografia"]
[null,null,null,"Note generali","Title from title screen (viewed October 6, 2014)."]
[{"$nulls":4},"\"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.\""]
[null,null,null,"Nota di bibliografia","Includes bibliographical references (pages 44-46) and index."]