Douglass, R. C. (1962). Fusulinidae of the Brownville through. Americus interval in Kansas. In: Stratigraphy and paleontology of the uppermost Pennsylvanian and lowermost Permian rocks in Kansas, with sections on paleontology. USGS, Professional Paper. 323: 55-64.
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Douglass, R. C.
1962
Fusulinidae of the Brownville through. Americus interval in Kansas. In: Stratigraphy and paleontology of the uppermost Pennsylvanian and lowermost Permian rocks in Kansas, with sections on paleontology