Columbia subject headings:
Harvard subject headings:
Colombia--Politics and government--1946-1974.
Riots--Colombia--Barrabcabermeja.
Working class--Colombia--Barrancabermeja.
Princeton subject headings:
Barrancabermeja (Colombia)--History.
Colombia--Foreign relations--United States.
Communism--Colombia--Barrancabermeja--History--20th century.
Government, Resistance to--Colombia--Barrancabermeja--History--20th century.
Labor disputes--Colombia--Barrancabermeja--History--20th century.
Petroleum workers--Labor unions--Colombia--Barrancabermeja--History--20th century.
Social conflict--Colombia--Barrancabermeja--History--20th century.
Socialism--Colombia--Barrancabermeja--History--20th century.
Strikes and lockouts--Petroleum industry--Colombia--Barrancabermeja--History--20th century.
Working class--Colombia--Barrancabermeja--Political activity--History--20th century.