Pneumoconiosis – a review. Transactions of the Seventh Commonwealth mining and metallurgical congress. Johannesburg Author: Orenstein AJ, Webster I. Source: S A Institute of Mining and metallurgy. 1961; 1:321-337. Babalwa Jekwa2019-04-12T11:50:30+02:00Dec 31st, 1961| Share This Page, Choose Your Platform! FacebookTwitterLinkedInWhatsappEmail