Combined effect of dust exposure and tobacco smoking on the occurrence of lung diseases in South African gold miners Authors: Hnizdo E. Source: Doctor of Philosophy, Faculty of Medicine, University of the Witwatersrand, 1991. Babalwa Jekwa2019-04-03T14:51:00+02:00Dec 31st, 1991| Share This Page, Choose Your Platform! FacebookTwitterLinkedInWhatsappEmail