Columbia subject headings:
Mineral industries--Mexico--History--19th century.
Miners--Mexico--History--19th century.
Mines and mineral resources--Mexico--History.
Harvard subject headings:
Mineral industries--Mexico--History--19th century.
Miners--Mexico--History--19th century.
Mines and mineral resources--Mexico--History.
Princeton subject headings:
Mineral industries--Mexico--History--19th century.
Miners--Mexico--History--19th century.
Mines and mineral resources--Mexico--History.