Mamay, S. H. 1. (1976). Paleozoic origin of the cycads. Washington: United States Government Printing Office.
Citación estilo ChicagoMamay, Sergius H. 1920-2008. Paleozoic Origin of the Cycads. Washington: United States Government Printing Office, 1976.
Cita MLAMamay, Sergius H. 1920-2008. Paleozoic Origin of the Cycads. Washington: United States Government Printing Office, 1976.
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