Columbia subject headings:
Mineral industries--Study and teaching--History--18th century--Congresses.
Mineral industries--Study and teaching--History--19th century--Congresses.
Harvard subject headings:
Mineral industries--Study and teaching--History--18th century--Congresses.
Mineral industries--Study and teaching--History--19th century--Congresses.
Princeton subject headings:
Mineral industries--Study and teaching--History--18th century--Congresses.
Mineral industries--Study and teaching--History--19th century--Congresses.