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