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by Reuning, Ernst , 1923

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by Sawyer, Arthur Robert , Published in Transactions of the Institution of Mining Engineers (1907)

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by Sawyer, Arthur Robert , Published in Transactions of the Institution of Mining Engineers (1906)

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by Knop, Adolf , Published in Bericht über die 22. Versammlung des Oberrheinischen geologischen Vereins (1889)

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by Meunier, Léonie , Published in Bulletins de l'Academie royale de Belgiqué, 3. Serie, Band 3, Nummer 4, April 1882 (1882)

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