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Avec objets numériques James Charles Napoleon Humphreys, Mining papers
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Underground plan of Upper Leader and Black Reef Leader workings
Underground plan of Upper Leader and Black Reef Leader workings
Underground plan of Main Reef Leader workings
Underground plan of Main Reef Leader 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
Underground workings
Underground workings
Underground workings
Underground workings
Underground workings
Underground workings
Underground plan of Main Reef Leader workings
Underground plan of Main Reef Leader workings
Underground plan of Upper Leader and Black Reef Leader workings
Underground plan of Upper Leader and Black Reef Leader workings
Underground plan of Main Reef Leader working
Underground plan of Main Reef Leader working
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