An investigation concerning recorded dust counts and silicosis in South African controlled gold mines of the Witwatersrand and extensions and the Orange Free State

Du Toit, Rudolp Stephanus Jacobus2015-01-202015-01-202015-01-20http://hdl.handle.net/10539/16616enAn investigation concerning recorded dust counts and silicosis in South African controlled gold mines of the Witwatersrand and extensions and the Orange Free StateThesis