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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 of Bird Reef
Underground workings of Bird Reef
Underground workings
Underground workings
Underground workings
Underground workings
Underground workings of Upper Leader
Underground workings of Upper Leader
Underground workings
Underground workings
Underground plan of Upper Leader and Black Reef Leader workings
Underground plan of Upper Leader and Black Reef Leader workings
Underground workings
Underground workings
Plan of workings
Plan of workings
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