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James Charles Napoleon Humphreys, Mining papers Pièce Avec objets numériques
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Plan of Houtpoort section with boreholes, shafts and underground development
Plan of Houtpoort section with boreholes, shafts and underground development
Plan of holdings with boreholes, shafts and underground development
Plan of holdings with boreholes, shafts and underground development
Underground workings of Main Reef
Underground workings of Main Reef
Underground workings of South Reef
Underground workings of South Reef
Underground workings of Main Reef
Underground workings of Main Reef
Underground workings of South Reef
Underground workings of South Reef
Underground workings of Main Reef
Underground workings of Main Reef
Underground workings of South Reef
Underground workings of South Reef
Underground workings of Main Reef
Underground workings of Main Reef
Underground workings of South Reef
Underground workings of South Reef
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