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Historical Papers Research Archive, University of the Witwatersrand James Charles Napoleon Humphreys, Mining papers Pièce
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Underground workings
Underground workings
Underground workings
Underground workings
Underground workings of Main Reef and Main Reef Leader
Underground workings of Main Reef and Main Reef Leader
Underground workings of Upper Leaders
Underground workings of Upper Leaders
Underground workings of Main Reef and Main Reef Leader
Underground workings of Main Reef and Main Reef Leader
Underground workings of Upper Leader
Underground workings of Upper Leader
Underground workings of Upper Leaders
Underground workings of Upper Leaders
Underground workings
Underground workings
Underground workings
Underground workings
Underground workings
Underground workings
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