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  1. 1
    by Derigs, Ulrich, 1950-
    Published 1978
    Germany : Universität Köln, 1978.
    155 p.
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  2. 2
    by Derigs, Ulrich, 1950-
    Published 1981
    Köln : F. Hansen, [1981]
    205 p. : ill. ; 21 cm.
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