Columbia subject headings:
Chad--Politics and government--1960-1990.
Guengueng, Souleymane.
Political prisoners--Chad--Biography.
Harvard subject headings:
Chad--History--1960-1990
Chad--History--1990-
Guengueng, Souleymane.
Human rights workers--Chad--Biography.
Political prisoners--Chad--Biography.
Prisons--Chad.
Princeton subject headings:
Chad--History--1960-1990.
Chad--History--1990-
Guengueng, Souleymane
Human rights workers--Chad--Biography.
Political prisoners--Chad--Biography.
Prisons--Chad.