Woodring, W. P. (1973). Geology and paleontology of the Canal Zone and adjacent parts of Panama: description of Tertiary mollusks (additions to gastropods, scaphopods, pelecypods: Nuculidae to Malleidae). United States Geological Survey Professional Paper. 306-E: 453-539.
Geology and paleontology of the Canal Zone and adjacent parts of Panama: description of Tertiary mollusks (additions to gastropods, scaphopods, pelecypods: Nuculidae to Malleidae)
United States Geological Survey Professional Paper