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Lee |
1981 |
Permian ammonoid fauna of Venezuela.
Proceedings of the Geological Society of China, 24: 75-86, fig.1-4, pl.1; T'ai-pei, Taiwan.
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Miller & Williams |
1945 |
Permian cephalopods from Northern Columbia.
Journal of Paleontology, 19 (4): 347-349, fig.1, pl.51; Tulsa,Oklahoma.
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