MolluscaBase source details
Hanna, G D. & Nicholson, J. L. (1930). Rediscovery of Polygyra roperi Pilsbry. The Nautilus. 44(1): 17-18.
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Hanna, G D. & Nicholson, J. L.
1930
Rediscovery of <i>Polygyra roperi</i> Pilsbry
The Nautilus
44(1): 17-18
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