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  1. 1
    by Schaeffer, O. A. 1919-
    Published 1966
    Book

    Potassium argon dating
  2. 2
    by Berckhemer, Fritz 1890-1954
    Published 1957
    Book

    The language of rocks.
  3. 3
    by Schlossmacher, Karl
    Published 1954
    Book

    Edelsteine und Perlen.
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