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  1. By: Oort, Eduard Daniel van,
    Publication info: Leiden [Netherlands] :E.J. Brill,1904.
    Holding Institution: Smithsonian Libraries
  2. By: Koekkoek, M. A. (Marianus Adrianus) - Oort, Eduard Daniel van, - Brouwer, Gerrit Anton,
    Publication info: 's-Gravenhage,M. Nijhoff,1922-35.
    Holding Institution: Smithsonian Libraries