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  1. 1
    by Kobi, Franz, 1905-
    Published 1931
    Bern, Stämpfli, 1931.
    41 p. diagrs. 23 cm.
  2. 2
    by Zollinger, Richard, 1913-
    Published 1945
    Thalwil, Buchdruckerei F. Tellenbach, 1945.
    116 p. 1 l. xii diagrs. 23 cm.

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