Columbia subject headings:
Mines and mineral resources--South Africa.
Harvard subject headings:
Chamber of Mines of South Africa--Periodicals.
Coal mines and mining--South Africa--Periodicals.
Gold mines and mining--South Africa--Periodicals.
Princeton subject headings:
Chamber of Mines of South Africa--Periodicals.
Coal mines and mining--South Africa--Periodicals.
Gold mines and mining--South Africa--Periodicals.