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Woodring, W. P. (1964). Geology and paleontology of the Canal Zone and adjoining parts of Panama. Geology and description of the Tertiary Mollusks (Gastropods: Columbellidae to Volutidae). United States Geological Survey Professional Paper. 306-C: 241-297.
Woodring, W. P. (1964). Geology and paleontology of the Canal Zone and adjoining parts of Panama. Geology and description of the Tertiary Mollusks (Gastropods: Columbellidae to Volutidae). United States Geological Survey Professional Paper. 306-C: 241-297.
