Rock instability problems in mine shafts /
International Society for Rock Mechanics, South African National Group.

APA Citation

South African National Group on Rock Mechanics., SANGORM Symposium (1990 : Potchefstroom, S. Africa). (1990). Rock instability problems in mine shafts. [Johannesburg, South Africa?: The Group?.

MLA Citation

South African National Group on Rock Mechanics, and South Africa) SANGORM Symposium (1990 : Potchefstroom. Rock Instability Problems In Mine Shafts. [Johannesburg, South Africa?: The Group?, 1990.