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  1. 1
    by Cellar, Horst, 1939-
    Published 1989
    Mülheim/Ruhr : Kirnberg-Verlag, 1989.
    iii, 146 p. : ill. ; 21 cm.
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  2. 2
    by Spang, Raymund M.
    Published 1980
    Bochum : Institut für Geologie der Ruhr-Universität, 1980.
    x, 190 p. : 40 ill. ; 30 cm.
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