Hustrulid, W. A.Gorman, Patrick W.2022-05-112022-05-111981https://hdl.handle.net/11124/13074Includes bibliographical references.masters thesesengCopyright of the original work is retained by the author.Boring South -- AfricaTunneling -- South AfricaRock mechanicsImprovement of tunnel boring techniques in South African hard rock conditionsText