Combined effect of silica dust and tobacco smoking on mortality from chronic obstructive lung disease in gold miners Author: Hnizdo E. Source: Br J Ind Med. 1990; 47:656-664. Babalwa Jekwa2019-04-02T14:22:15+02:00Dec 31st, 1990| Share This Page, Choose Your Platform! FacebookTwitterLinkedInWhatsappEmail