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Ulrich, E. O., Foerste, A. F.; Miller, A. K. (1943). Ozarkian and Canadian cephalopods. Part II, Brevicones. Geological Society of America Special Papers. 49: 1-240.
Ulrich, E. O., Foerste, A. F.; Miller, A. K. (1943). Ozarkian and Canadian cephalopods. Part II, Brevicones. Geological Society of America Special Papers. 49: 1-240.