Columbia subject headings:
Arbitration, Industrial--Mexico--Mexico City.
Local transit--Mexico--Mexico City.
Transport workers--Labor unions--Mexico--Mexico City.
Transport workers--Mexico--Mexico City.
Harvard subject headings:
Princeton subject headings:
Arbitration, Industrial--Mexico--Mexico City.
Labor policy--Mexico.
Local transit--Mexico--Mexico City.
Transport workers--Labor unions--Mexico--Mexico City.
Transport workers--Mexico--Mexico City.