Columbia subject headings:
Boundaries--Social aspects--Africa, West.
Cameroon--Boundaries--Chad.
Cameroon--Ethnic relations.
Chad--Boundaries--Cameroon.
Chad--Ethnic relations.
Harvard subject headings:
Boundaries--Social aspects--Africa, West.
Cameroon--Boundaries--Chad.
Cameroon--Ethnic relations.
Cameroon--Relations--Chad.
Cameroon--Social life and customs.
Chad--Boundaries--Cameroon.
Chad--Relations--Cameroon.
Chad--Social life and customs.
Princeton subject headings:
Cameroon--Relations--Chad.
Cameroon--Social life and customs.
Chad--Relations--Cameroon.
Chad--Social life and customs.