Bickel, D. (1973). Non-marine mollusks and two new species of Pisidium from the Tongue River Formation (Paleocene), of North Dakota. The Nautilus. 87(1): 13-18, figs. 1-16.
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Bickel, D.
1973
Non-marine mollusks and two new species of <em>Pisidium</em> from the Tongue River Formation (Paleocene), of North Dakota