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  1. By: Berg, Bengt Magnus Kristoffer,
    Publication info: Stockholm, P.A. Norstedt & s, [1922]
    Holding Institution: American Museum of Natural History Library
  2. By: Berg, Bengt Magnus Kristoffer,
    Publication info: Stockholm, P. A. Norstedt & söner, [1916-1919]
    Holding Institution: American Museum of Natural History Library