Mark C.G. (1912). The fossils of the Conemaugh Formation in Ohio. D. D. Condit, Conemaugh Formation in Ohio. Ohio Division of Geological Survey Bulletin, vol. 17. 261–326.
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Mark C.G.
1912
The fossils of the Conemaugh Formation in Ohio
D. D. Condit, Conemaugh Formation in Ohio. Ohio Division of Geological Survey Bulletin, vol. 17