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  1. 1
    by Stier, Otmar
    Published 1981
    Germany : Rheinisch-Westfälische Technische Hochschule Aachen, 1981.
    168 p. : ill., maps ; 21 cm.
  2. 2
    by Laschek, Dietmar, 1955-
    Published 1985
    [1985]
    133 p. : ill. ; 21 cm.

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