Effinger, W. L. (1938). The Gries Ranch fauna (Oligocene) of western Washington. <em>Journal of Paleontology.</em> 12(3): 355-390, pls. 45-47. page(s): 374, pl. 46, figs 27, 28 [details] Available for editors
MolluscaBase eds. (2025). MolluscaBase. Cirsochilus washingtonianus Effinger, 1938 †. Accessed through: Marine Species Traits editorial board (2025) Marine Species Traits at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1767733 on 2025-05-23
Marine Species Traits editorial board (2025). Marine Species Traits. Cirsochilus washingtonianus Effinger, 1938 †. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1767733 on 2025-05-23
original descriptionEffinger, W. L. (1938). The Gries Ranch fauna (Oligocene) of western Washington. <em>Journal of Paleontology.</em> 12(3): 355-390, pls. 45-47. page(s): 374, pl. 46, figs 27, 28 [details] Available for editors
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