|
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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Petersen, Korn & Kullmann |
2000 |
The Early Mississippian (Osagean) ammonoid Dzhaprakoceras (Cephalopoda) from Utah.
Journal of Paleontology, 74 (5): 853-857, 7 text-figs., Lawrence,KS.
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