Columbia subject headings:
Labor movement--Mexico--History--20th century.
Labor unions--Mexico--History--20th century.
Mexico--Economic conditions--20th century--Economic disparities.
Regional planning--Mexico.
Harvard subject headings:
Industrial relations--Mexico
Princeton subject headings:
Industrial relations--Mexico.
Labor movement--Mexico--History--20th century.
Labor unions--Mexico--History--20h century.
Mexico--Economic conditions--20th century--Economic disparities.