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  1. 1
    by Spiegelenberg, J. H.
    Published 1946
    Leiden, H.E. Stenfert Kroese, 1946.
    136 p. diagrs. 24 cm.
  2. 2
    by Poser, Günter
    Published 1969
    (München, Ifo-Inst. f. Wirtschaftsforschung, CIRET-Informations- u. Dokumentationszentrum) 1969.
    xii, 152 l. 30 cm.

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