An occupational hygiene assessment of a plant processing manganese. Abstract. SA Pharmacological Society Congress, Sandton 1990 Author: Yousefi V. Source: S Afr Med J. 1991; 80:456. Babalwa Jekwa2019-04-04T10:20:10+02:00Dec 31st, 1991| Share This Page, Choose Your Platform! FacebookTwitterLinkedInWhatsappEmail