WoRMS source details
Clench, W. J. (1940). Pyrgulopsis nevadensis Stearns in Oregon. The Nautilus. 53(4): 137.
438138
Clench, W. J.
1940
<i>Pyrgulopsis nevadensis</i> Stearns in Oregon
The Nautilus
53(4): 137
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Pyrgulopsis nevadensis (Stearns, 1883) (additional source)