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Historical Papers Research Archive, University of the Witwatersrand James Charles Napoleon Humphreys, Mining papers Unidad documental simple Con objetos digitales
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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 of Bird Reef
Underground workings of Bird Reef
Underground workings of Main Reef Leader
Underground workings of Main Reef Leader
Underground workings of Bird Reef
Underground workings of Bird Reef
Underground workings of Main Reef Leader
Underground workings of Main Reef Leader
Underground workings of South Reef
Underground workings of South Reef
Underground workings of Bird Reef
Underground workings of Bird Reef
Underground workings of Main Reef and Main Reef Leader
Underground workings of Main Reef and Main Reef Leader
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