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- [5] THE PROTECTION OF VERTICAL SHAFTS BY PILLARS IN SHALLOW AND MODERATELY DEEP HARD-ROCK MINES JOURNAL OF THE SOUTH AFRICAN INSTITUTE OF MINING AND METALLURGY, 1986, 86 (06): : 195 - 204
- [9] THE DESIGN OF PILLAR SYSTEMS AS PRACTICED IN SHALLOW HARD-ROCK TABULAR MINES IN SOUTH-AFRICA JOURNAL OF THE SOUTH AFRICAN INSTITUTE OF MINING AND METALLURGY, 1995, 95 (01): : 7 - 18