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  1. By: Filipʹev, Ivan Nikolaevich,
    Type: Article
    In: Smithsonian miscellaneous collections
    Volume: 89
    Date: 1935-03-20
    Page Range: 1--76
    Publication Info: Washington Smithsonian Institution 1862-1972
  2. By: Filipʹev, Ivan Nikolaevich,
    Type: Article
    In: Smithsonian miscellaneous collections
    Volume: 89
    Issue: 6
    Date: 1934
    Page Range: 1--63
    Publication Info: Washington Smithsonian Institution 1862-1972