Informe Anual - [S.l.] : Chamber of Mines of South Africa - Anual - 1983 (ene-dic); 1987 (ene-dic); 1990 (ene-dic); 1990-91 (ene-dic); 1991 (ene-dic); 1993-94 (ene-dic); 1994 (ene-dic)