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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 |
1948 |
The cephalopod fauna of the Mississippian Barnett Formation of Central Texas.
Journal of Paleontology, 22: 649-671, fig.1-3, pl.94-100; Tulsa, Okla.
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