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Geyer, G. (1994). Middle Cambrian mollusks from Idaho and early conchiferan evolution. New York State Museum, Bulletin. 481: 69−86, pl. 1.
Geyer, G. (1994). Middle Cambrian mollusks from Idaho and early conchiferan evolution. New York State Museum, Bulletin. 481: 69−86, pl. 1.
