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  1. 1
    by Hansen, Hans
    Published 1899
    Germany : Universität Kiel, 1899.
    23 p.
  2. 2
    by Hansen, Hans
    Published 1922
    1922.
    [4] p.
  3. 3
    by Hansen, Hans
    Published 1921
    1921.
    [1] p.
  4. 4
    by Hansen, Hans
    Published 1921
    1921.
    [2] p.
  5. 5
    by Hansen, Hans
    Published 1930
    Leipzig : Akad. Verlagsges, 1930.
    p. 1-26 : Ill., graph. Darst ; 8̊
  6. 6
    by Hansen, Hans
    Published 1929
    1929.
    [1] p.

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