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bookAt: Intr. Paleobot., New York, McGraw-Hill Book Company By: Arnold C. A.
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journalAt: Journal of the Washington Academy of Sciences, 25, 11 By: Read C. B.
journalAt: Modern Geology, 21, 3 By: Axsmith B. J., Taylor T. N., Fraser N. C., Olsen P. E.
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journalAt: American Journal of Science, Series 5, 8, 44=CCVIII By: Berry E. W.
journalAt: Journal of the Washington Academy of Sciences, 40, 10 By: Brown R. W.
journalAt: Palaeontology, 2, 2 By: Chaloner W. G., Lorch J. W.