Columbia subject headings:
Agricultural laborers--Labor unions--Spain--History--20th century.
Communist parties--Spain--History--20th century.
Elections--Spain--History--20th century.
Land reform--Spain--History--20th century.
Spain--Politics and government--1931-1939.
Strikes and lockouts--Agricultural laborers--Spain--History--20th century.
Harvard subject headings:
Agricultural laborers--Labor unions--Spain--History--20th century.
Agriculture--Economic aspects--Spain
Communist parties--Spain--History--20th century.
Elections--Spain--History--20th century.
Land reform--Spain--History--20th century.
Spain--Politics and government--1931-1939.
Strikes and lockouts--Agricultural laborers--Spain--History--20th century.
Princeton subject headings:
Agricultural laborers--Labor unions--Spain--History--20th century.
Communist parties--Spain--History--20th century.
Elections--Spain--History--20th century.
Land reform--Spain--History--20th century.
Spain--Politics and government--1931-1939.
Strikes and lockouts--Agricultural laborers--Spain--History--20th century.