Columbia subject headings:
Harvard subject headings:
Industrial relations--Colombia--History--20th century.
Labor policy--Colombia--History--20th century.
Strikes and lockouts--Colombia--History--20th century.
Working class--Political activity--Colombia--History--20th century.
Princeton subject headings:
Industrial relations--Colombia--History--20th century.
Labor policy--Colombia--History--20th century.
Strikes and lockouts--Colombia--History--20th century.
Working class--Political activity--Colombia--History--20th century.