Columbia subject headings:
Harvard subject headings:
Agricultural laborers--Labor unions--Mexico--Tamaulipas--History--20th century.
Agricultural laborers--Mexico--Tamaulipas--Political activity--History--20th century.
Liga de Comunidades Agrarias y Sindicatos Campesinos del Estado de Tamaulipas--Anniversaries, etc.
Peasants--Mexico--Tamaulipas--Political activity--History--20th century.
Peasants--Mexico--Tamaulipas--Societies, etc.--History--20th century.
Tamaulipas (Mexico)--Rural conditions.
Princeton subject headings:
Agricultural laborers--Labor unions--Mexico--Tamaulipas--History--20th century.
Agricultural laborers--Mexico--Tamaulipas--Political activity--History--20th century.
Liga de Comunidades Agrarias y Sindicatos Campesinos del Estado de Tamaulipas--Anniversaries, etc.
Peasants--Mexico--Tamaulipas--Political activity--History--20th century.
Peasants--Mexico--Tamaulipas--Societies, etc.--History--20th century.
Tamaulipas (Mexico)--Rural conditions.