Columbia subject headings:
Harvard subject headings:
Labor disputes--Mexico.
Miners--Mexico--History.
Strikes and lockouts--Miners--Mexico
Princeton subject headings:
Alemán, Miguel, 1905-1983.
Iron and steel workers--Labor unions--Mexico.
Labor policy--Mexico--History.
Metal-workers--Labor unions--Mexico.
Mexico--Politics and government--1946-1970.
Miners--Labor unions--Mexico.