basis of recordDall, W. H. (1905). <i>Land and fresh water mollusks of Alaska and adjoining regions</i>. in: <i>Alaska. Harriman Alaska Expedition with cooperation of Washington Academy of Sciences</i>. vol. 13: i-vii + 1-171. , available online athttps://www.biodiversitylibrary.org/page/21386445 page(s): 76, fig. 57 [details]
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