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  1. 1
  2. 2
    by Frei, Peter Leo, 1945-
    Published 1986
    Bern ; New York : P. Lang, c1986.
    213, xxi p. : ill. ; 21 cm.
  3. 3
    by Kappeler, Roland
    Published 1997
    Zürich : Verlag des Schweizerischen Kaufmännischen Verbandes, c1997.
    432 p. : ill., maps ; 23 cm.

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