The activities of the South African committee on cumulative dust exposure records Authors: Du Toit RSJ, Isserow LW, De Villiers Oxford D, Webster I, Irwig LM, et al. Source: Ann Occup Hyg. 1977; 20:271-277. Babalwa Jekwa2019-04-15T11:59:24+02:00Dec 31st, 1977| Share This Page, Choose Your Platform! FacebookTwitterLinkedInWhatsappEmail