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Doguzhaeva, Mapes & Mutvei |
1997 |
Beaks and radulae of Early Carboniferous goniatites.
Lethaia 30: 305-313, 6 figs., Oslo.
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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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