Columbia subject headings:
Colombia--History--1903-1946.
Colombia--Social conditions--20th century.
Labor movement--Colombia--History--20th century.
Protest movements--Colombia--History--20th century.
Social movements--Colombia--History--20th century.
Socialism--Colombia--History--20th century.
Harvard subject headings:
Colombia--History--1903-1946.
Colombia--Social conditions--20th century.
Labor movement--Colombia--History--20th century.
Protest movements--Colombia--History--20th century.
Social movements--Colombia--History--20th century.
Socialism--Colombia--History--20th century.
Princeton subject headings:
Colombia--History--1903-1946.
Colombia--Social conditions--20th century.
Labor movement--Colombia--History--20th century.
Protest movements--Colombia--History--20th century.
Social movements--Colombia--History--20th century.
Socialism--Colombia--History--20th century.