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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 & Downs |
1948 |
A cephalopod fauna from the type section of the Pennsylvanian "Winslow Formation" of Arkansas.
Journal of Paleontology, 22 (6): 672-680,fig.1-3, pl.101-103; Tulsa, Okla.
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