Columbia subject headings:
Africa--Foreign economic relations--United States.
Energy development--Africa.
Energy industries--Africa.
Gas industry--Africa.
Petroleum industry and trade--Africa.
United States--Foreign economic relations--Africa.
Harvard subject headings:
Africa--Foreign economic relations--United States.
Energy development--Africa.
Energy industries--Africa.
Gas industry--Africa.
Petroleum industry and trade--Africa.
United States--Foreign economic relations--Africa.
Princeton subject headings:
Africa--Foreign economic relations--United States.
Energy development--Africa.
Energy industries--Africa.
Gas industry--Africa.
Petroleum industry and trade--Africa.
United States--Foreign economic relations--Africa.