@inbook{MolluscaBase:SourceID:356868, author = {Cooper, J. G.}, title = {Geographical catalogue of the Mollusca found west of the Rocky Mountains, between latitudes 33° and 49° north. San Francisco: Geological Survey of California. 40 pp.}, url = {https://www.molluscabase.org/aphia.php?p=sourcedetails&id=356868}, year = {1867} }