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  1. By: Pfeiffer, Louis (Ludwig Georg Karl),
    Publication info: Cassellis, sumptibus T. Fischer, 1865
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: Pneumonochlamyda  
  2. By: Pfeiffer, Louis (Ludwig Georg Karl),
    Publication info: Cassellis, sumptibus Theodori Fischer; [etc., etc.], 1852
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: Pneumonochlamyda  
  3. By: Pfeiffer, Louis (Ludwig Georg Karl),
    Publication info: Cassellis, sumptibus T. Fischer, 1876
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: Gastropoda  Pneumonochlamyda  
  4. By: Pfeiffer, Louis (Ludwig Georg Karl),
    Publication info: Cassellis, T. Fischer, 1858
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: Pneumonochlamyda