Woodring, W. P. (1970). Geology and Paleontology of Canal Zone and Adjoining Parts of Panama. Description of Tertiary Mollusks (Gastropods: Eulimidae, Marginellidae to Helminthoglyptidae). United States Geological Survey Professional Paper. 306-D: 299-452.
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Woodring, W. P.
1970
Geology and Paleontology of Canal Zone and Adjoining Parts of Panama. Description of Tertiary Mollusks (Gastropods: Eulimidae, Marginellidae to Helminthoglyptidae)
United States Geological Survey Professional Paper