Columbia subject headings:
Harvard subject headings:
Coal miners--Labor unions--Mexico--Coahuila (State)--History.
Coal miners--Mexico--Coahuila (State)--History.
Princeton subject headings:
Coal miners--Labor unions--Mexico--Nueva Rosita--History--20th century.
Coal miners--Mexico--Nueva Rosita--History--20th century.
Industrial relations--Mexico--Nueva Rosita--History--20th century.
Labor movement--Mexico--Nueva Rosita--History--20th century.
Syndicalism--Mexico--Nueva Rosita--History--20th century.