Columbia subject headings:
Chad--Politics and government--1960-1990.
Harvard subject headings:
Chad--Foreign relations--Libya.
Chad--History--Civil War, 1965-
Chad--Politics and government--1960-
Habré, Hissein
Libya--Foreign relations--Chad.
Petroleum industry and trade--Chad.
Princeton subject headings:
Chad--Foreign relations--Libya.
Chad--History--Civil War, 1965-
Chad--Politics and government--1960-1990.
Habré, Hissein.
Libya--Foreign relations--Chad.
Petroleum industry and trade--Chad.