Geology and paleontology of Canal Zone and adjoining parts of Panama; description of Tertiary mollusks (additions to gastropods, scaphopods, pelecypods: Nuclidae to Malleidae)
Geology and paleontology of Canal Zone and adjoining parts of Panama; description of Tertiary mollusks (additions to gastropods, scaphopods, pelecypods: Nuclidae to Malleidae)