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  1. 1
    by Schaeppi, Yvonne, 1921-
    Published 1945
    Zürich, Dissertationsdruckerei Gebr. Leemann, 1945.
    72, [2] p. diagrs. 23 cm.
  2. 2
    by Keller, Rudolf, 1915-
    Published 1945
    Aarau, Graphische werkstätten H.R. Sauerländer & Co., 1945.
    127, [1] p. tables, diagrs. 23 cm.
  3. 3
    by Hofmann, Eugen, 1928-
    Published 1958
    Zürich, Juris-Verlag, 1958.
    76 p. illus. 22 cm.

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