|
Gordon |
1965 |
Carboniferous Cephalopods of Arkansas.
Professional Papers, U.S. Geological Survey, 460: 1-322, fig.1-96, pl.1-32; Washington. [imprint 1964].
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Miller, Youngquist & Nielsen |
1952 |
Mississippian cephalopods from Western Utah.
Journal of Paleontology, 26: 148-161, 5 text-figs., pl.25-26; Tulsa, Okla.
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