Columbia subject headings:
Harvard subject headings:
Coal mines and mining--Europe--History--Sources.
Coal mines and mining--Study and teaching--Europe.
Mines and mineral resources--Europe--History--Sources.
Mining schools and education--Europe--History.
Princeton subject headings:
Coal mines and mining--Europe--History--Sources.
Coal mines and mining--Study and teaching--Europe.
Mines and mineral resources--Europe--History--Sources.
Mining schools and education--Europe--History.