Clarke, J. M.; Swartz, C. K. (1913). Systematic paleontology of the Upper Devonian deposits of Maryland. In: Maryland Geological Survey. Middle and Upper Devonian. The Johns Hopkins Press, Baltimore, pp. 535-702.
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Clarke, J. M.; Swartz, C. K.
1913
Systematic paleontology of the Upper Devonian deposits of Maryland
In: Maryland Geological Survey. Middle and Upper Devonian. The Johns Hopkins Press, Baltimore, pp. 535-702