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Ulrich, E. O.; Foerste, A. F.; Miller, A. K.; Unklesbay, A. G. (1944). Ozarkian and Canadian Cephalopods: Part III: Longicones and Summary. Geological Society of America Special Papers. 59: 1-226.
Ulrich, E. O.; Foerste, A. F.; Miller, A. K.; Unklesbay, A. G. (1944). Ozarkian and Canadian Cephalopods: Part III: Longicones and Summary. Geological Society of America Special Papers. 59: 1-226.