Woodring, W. P. (1959). Geology and paleontology of the Canal Zone and adjoining parts of Panama. Description of Tertiary mollusks (Gastropods: Vermetidae to Thaididae). United States Geological Survey Professional Paper. 306-A: 147-239.
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Woodring, W. P.
1959
Geology and paleontology of the Canal Zone and adjoining parts of Panama. Description of Tertiary mollusks (Gastropods: Vermetidae to Thaididae).
United States Geological Survey Professional Paper