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Wright, W. B. (1936). The Group of Large Carbonicolas which characterize the Base of the Middle Coal Measures. Summary of Progress of the Geological Survey. 1934(2): 60-65.
Wright, W. B. (1936). The Group of Large Carbonicolas which characterize the Base of the Middle Coal Measures. Summary of Progress of the Geological Survey. 1934(2): 60-65.
