Columbia subject headings:
Economic development projects--Chad.
Petroleum industry and trade--Chad.
Petroleum pipelines--Cameroon.
Petroleum pipelines--Chad.
Harvard subject headings:
Economic development projects--Chad.
Petroleum industry and trade--Chad.
Petroleum pipelines--Cameroon.
Petroleum pipelines--Chad.
Princeton subject headings:
Economic development projects--Chad.
Petroleum industry and trade--Chad.
Petroleum pipelines--Cameroon.
Petroleum pipelines--Chad.