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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 plan shewing workings
Underground plan shewing workings
Underground workings
Underground workings
Underground workings of Main Reef Leader and South Reef
Underground workings of Main Reef Leader and South Reef
Underground workings of Bird Reef
Underground workings of Bird Reef
Underground workings
Underground workings
Underground workings
Underground workings
Underground workings of Upper Leaders
Underground workings of Upper Leaders
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