Geology and paleontology of Canal Zone and adjoining parts of Panama : description of Tertiary mollusks (Pelecypods: Propeamussiidae to Cuspidariidae; addtions to families covered in P 306-E; additions to Gastropods; Cephalopods) - Woodring, W. P. 1891-1983 (Geological Survey professional paper ;, 1982)