Columbia subject headings:
Mineral industries--Europe--History--17th century--Congresses.
Mineral industries--Europe--History--18th century--Congresses.
Mineral industries--Europe--History--19th century--Congresses.
Harvard subject headings:
Coal mines and mining--Europe--History--17th century--Congresses.
Coal mines and mining--Europe--History--18th century--Congresses.
Coal mines and mining--Europe--History--19th century--Congresses.
Mineral industries--Europe--History--17th century--Congresses.
Mineral industries--Europe--History--18th century--Congresses.
Mineral industries--Europe--History--19th century--Congresses.
Princeton subject headings:
Coal mines and mining--Europe--History--17th century--Congresses.
Coal mines and mining--Europe--History--18th century--Congresses.
Coal mines and mining--Europe--History--19th century--Congresses.
Mineral industries--Europe--History--17th century--Congresses.
Mineral industries--Europe--History--18th century--Congresses.
Mineral industries--Europe--History--19th century--Congresses.