Dall, 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): 82, 86 [details]
original descriptionDall, 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): 82, 86 [details]
additional sourceDall, W. H. (1906). Note on <i>Vitrina pfeifferi</i> Deshayes. <em>The Nautilus.</em> 19(9): 107-108., available online athttps://www.biodiversitylibrary.org/page/1755682 page(s): 108; note: As Paraspera [details]
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