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Nassichuk & Spinosa |
1972 |
Early Permian (Asselian) ammonoids from the Hare Fiord Formation, Northern Ellesmere Island.
Journal of Paleontology, 46 (4): 536-544, fig.1-5, tab.1-3, 1pl.; Tulsa, Okla.
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Nassichuk |
1977 |
Upper Permian ammonoids from the Cache Creek Group in Western Canada.
Journal of Paleontology, 51 (3): 557-590, fig.1-20, tab.1-7, pl.1-3; Tulsa, Okla.
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