Dunbar, C. O.; Condra, G. E. (1932). Brachiopoda of the Pennsylvanian System in Nebraska. Nebraska Geological Survey, Bulletin, second series. 5: 1-377.
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Dunbar, C. O.; Condra, G. E.
1932
Brachiopoda of the Pennsylvanian System in Nebraska
Nebraska Geological Survey, Bulletin, second series