[4]
Geotechnical classification of deep and ultra-deep Witwatersrand mining areas, South Africa[J] . J. K. Schweitzer,R. A. Johnson.Mineralium Deposita . 1997 (4)
[4]
Geotechnical classification of deep and ultra-deep Witwatersrand mining areas, South Africa[J] . J. K. Schweitzer,R. A. Johnson.Mineralium Deposita . 1997 (4)