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  1. 1
    by Maas, Wolfgang, 1942-
    Published 1968
    Bonn : [Druck : Rheinische Friedrich-Wilhelms-Universität], 1968.
    151 p. ; 21 cm.
  2. 2
    Bonn, C. Georgi, 1890.
    3 p. l., 109, [1] p. incl. diagrs. 25 cm.
  3. 3
    by Merrem, Gerhard-Oskar, 1911-
    Published 1937
    [Bonn] : Gebr. Scheur, 1937.
    127 p. ; 21 cm.
  4. 4
    by Hein, Ruth, 1912-
    Published 1938
    Düsseldorf : G.H. Nolte, 1938.
    ix, 61 p. ; 22 cm.

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