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Mapes & Furnish |
1981 |
The Pennsylvanian ammonoid family Welleritidae.
Journal of Paleontology, 55 (2): 317-330, fig.1-8, pl.1-2; Tulsa, Okla.
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Miller & Furnish |
1958a |
Middle Pennsylvanian Schistoceratidae (Ammonoidea).
Journal of Paleontology, 32 (2): 253-268, fig.1-9, pl.33-34; Tulsa,Oklahoma.
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