Binney, W. G. (1857). Notes on American land shells. No. 2. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 9: 183-193., available online athttps://www.biodiversitylibrary.org/page/6330449 page(s): 186-187 [details]
MolluscaBase eds. (2021). MolluscaBase. Helix kopnodes W. G. Binney, 1857. Accessed at: http://www.molluscabase.org/aphia.php?p=taxdetails&id=1365419 on 2024-03-29
original descriptionBinney, W. G. (1857). Notes on American land shells. No. 2. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 9: 183-193., available online athttps://www.biodiversitylibrary.org/page/6330449 page(s): 186-187 [details]
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