Pretoria Portland Cement Co., Ltd. Add to clipboard ZA HPRA A1138-CCC-2225 File Part of James Charles Napoleon Humphreys, Mining papers
Union Castle Co. Add to clipboard ZA HPRA A1138-CCC-2224 File Part of James Charles Napoleon Humphreys, Mining papers
Groenkloof Brick, Tile and Pottery Factory Ltd., Pretoria Add to clipboard ZA HPRA A1138-CCC-2223 File Part of James Charles Napoleon Humphreys, Mining papers
Magista Slate Quarries, Ltd. Add to clipboard ZA HPRA A1138-CCC-2222 File Part of James Charles Napoleon Humphreys, Mining papers
Vianini Ferro - Concrete Pipes (Brits.) Add to clipboard ZA HPRA A1138-CCC-2221 File Part of James Charles Napoleon Humphreys, Mining papers
Imperial Chemical Industries Add to clipboard ZA HPRA A1138-CCC-2220 File Part of James Charles Napoleon Humphreys, Mining papers
Rock Bursts Add to clipboard ZA HPRA A1138-DDD-2283 File Part of James Charles Napoleon Humphreys, Mining papers
Low Grade Ore Add to clipboard ZA HPRA A1138-DDD-2282 File Part of James Charles Napoleon Humphreys, Mining papers
Support of Workings Add to clipboard ZA HPRA A1138-DDD-2281 File Part of James Charles Napoleon Humphreys, Mining papers
Government Miners Training Schools Add to clipboard ZA HPRA A1138-DDD-2280 File Part of James Charles Napoleon Humphreys, Mining papers