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  1. 1
    by Becker, Heinz
    Published 1928
    Germany : Rheinische Friedrich-Wilhelms-Universität zu Bonn, 1928.
    30 p.
  2. 2
    by Becker, Heinz
    Published 1976
    Witterschlick b. Bonn : Schwarzbold, 1976.
    47 S : graph. Darst., Tab.
  3. 3
    by Becker, Heinz
    Published 1990
    Germany : Universität Bonn, 1990.
    92 S : graph. Darst ; 21 cm.

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