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12by Reusch, Hans; Kjerulf, Theodor , Published in Geologiska Föreningens i Stockholm förhandlingar (1885)Book Special Print
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15by Deutsche Rohstoffagentur , 2015
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18by Ehrenberg, Hans; Pilger, Andreas; Schröder, Fritz , 1954In collection: Geologisches Jahrbuch / BeihefteIn collection: Monographien der deutschen Blei-Zink-ErzlagerstättenBook
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19by Wang, Yinchang Tsenshan , Published in Bulletin of American Institute of Mining Engineers (1915)Volume Special Print
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20by Legraye, Michel , Published in Annales de la Société Géologique de Belgique (1938)Volume Special Print