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Nassichuk |
1971 |
Permian ammonoids and nautiloids, Southeastern Eagle Plain, Yukon Territory.
Journal of Paleontology, 45 (6): 1001-1021, fig.1-12, tab.1-3, pl.124-126; Tulsa,Oklahoma.
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Tharalson |
1984 |
Revision of the Early Permian ammonoid family Perrinitidae.
Journal of Paleontology, 58 (3): 804-833, fig.1-24, 1tab.; Lawrence, Kansas.
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