Thomas, I. (1914). The British Carboniferous Producti; pt. I, Genera Pustula and Overtonia. Memoirs of the Geological Survey of Great Britain, Palaeontology. 1(4): 197-366.
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Thomas, I.
1914
The British Carboniferous Producti; pt. I, Genera Pustula and Overtonia
Memoirs of the Geological Survey of Great Britain, Palaeontology.