McKinnon, Stephen David
Protection of deep vertical shaft systems / Stephen David McKinnon - [S.l] Johannesburg 1989 - variged pagings
251433
Michanical engineering
Shaft systems-mathematical models
621 / MAC
Protection of deep vertical shaft systems / Stephen David McKinnon - [S.l] Johannesburg 1989 - variged pagings
251433
Michanical engineering
Shaft systems-mathematical models
621 / MAC