Geology and Paleontology of canal zone and adjoining parts of Panama : description of Tertiary mollusks (Gastropods : Eulimidae, Marginellidae to Helminthoglyptidae) /
W. P. Woodring.
-- Washington : United States Government Printing Office, 1970
- P. 300-452, [19] h. de lam. --
(Geological Survey Professional Paper ; 306-D).
Canal de Panamá Gasterópodos Geología Paleontología