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  1. 1
    by Zbinden, Karl
    Published 1931
    Affoltern am Albis, J. Weiss, 1931.
    xx, 209 p. incl. tables. 23 cm.
  2. 2
    by Erb, Konrad
    Published 1906
    Bern : Buchdruckerei Gustav Grunau, 1906.
    108 p. ; 23 cm.

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