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James Charles Napoleon Humphreys, Mining papers Unidad documental simple
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Surface plan
Surface plan
Surface plan
Surface plan
Underground workings
Underground workings
Underground workings
Underground workings
Underground workings of Upper Leaders
Underground workings of Upper Leaders
Underground plan shewing workings
Underground plan shewing workings
Underground plan shewing workings
Underground plan shewing workings
Underground plan shewing workings
Underground plan shewing workings
Underground workings of Main Reef and Main Reef Leader
Underground workings of Main Reef and Main Reef Leader
Underground plan of Main Reef Leader workings
Underground plan of Main Reef Leader workings
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