Columbia subject headings:
Colombia--Economic conditions.
Colombia--Social conditions.
Empresa Colombiana de Petróleos.
Petroleum industry and trade--Colombia.
Harvard subject headings:
Barrancabermeja (Colombia)--Economic conditions.
Barrancabermeja (Colombia)--Social conditions.
Empresa Colombiana de Petróleos.
Princeton subject headings:
Barrancabermeja (Colombia)--Economic conditions.
Barrancabermeja (Colombia)--Social conditions.
Empresa Colombiana de Petróleos.