Columbia subject headings:
Harvard subject headings:
Mineral industries--Government ownership--Mexico--History--20th century--Sources.
Mineral industries--Government ownership--Mexico--History--20th century.
Mineral industries--Government policy--Mexico--History--20th century--Sources.
Mineral industries--Government policy--Mexico--History--20th century.
Princeton subject headings:
Industrial policy--Mexico--History--20th century.
Mineral industries--Mexico--History--20th century.
Miners--Mexico--History--20th century.
Mines and mineral resources--Mexico--History--20th century.