basis of recordMarsh, W. A. (1889). Brief notes on the land and fresh-water shells of Mercer County, Ill. <em>The Nautilus.</em> 3(2): 23-24; 3(3): 34-35., available online athttps://www.biodiversitylibrary.org/page/12596393 page(s): 23-24 [details]
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