Columbia subject headings:
Greeks--Pontus.
Mineral industries--Europe--History--19th century.
Mineral industries--Turkey--History.
Miners--Turkey.
Mines and mineral resources--Turkey--History.
Harvard subject headings:
Greeks--Pontus.
Mineral industries--Europe--History--19th century.
Mineral industries--Turkey--History.
Miners--Turkey.
Mines and mineral resources--Turkey--History.
Princeton subject headings:
Mineral industries--Europe--History--19th century.
Mineral industries--Turkey--History.
Mines and mineral resources--Turkey--History.