Columbia subject headings:
Harvard subject headings:
Environmental law--Africa, Central.
Petroleum industry and trade--Chad.
Petroleum law and legislation--Africa, Central.
Petroleum law and legislation--Chad.
Petroleum pipelines--Cameroon.
Petroleum pipelines--Chad.
Petroleum--Environmental aspects--Africa, Central.
Princeton subject headings:
Petroleum industry and trade--Chad.
Petroleum law and legislation--Africa, Central.
Petroleum--Environmental aspects--Africa, Central.