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The technique of mining in the Ruhr
Fritche, C. H. - 1947
Persistent link: https://www.econbiz.de/10001534425
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Franz Haniel mine
1948
Persistent link: https://www.econbiz.de/10001534427
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The use of large mine cars in the Ruhr
Glebe, E. - 1947
Persistent link: https://www.econbiz.de/10001534455