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The Occurrence of Sphenopteris germanica (Pteridosperm, Autunian, Lower Permian) in North America
Hermann W. Pfefferkorn and David A. ResnikVolume:
54
Language:
english
Journal:
Journal of Paleontology
DOI:
10.2307/1304164
Date:
April, 1980
File:
PDF, 608 KB
english, 1980