An assessment of the respiratory health status of foundry workers known to be exposed to silica dust at work Author: Zwi A. Source: Doctor of Philosophy, Faculty of Medicine, University of the Witwatersrand, 1994. Babalwa Jekwa2019-04-05T13:50:25+02:00Dec 31st, 1994| Share This Page, Choose Your Platform! FacebookTwitterLinkedInWhatsappEmail