Gude, G. K. & Woodward, B. B. (1921). On Helicella, Férussac. Proceedings of the Malacological Society of London. 14 (5/6): 174-190. London [24 October].
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Gude, G. K. & Woodward, B. B.
1921
On Helicella, Férussac
Proceedings of the Malacological Society of London