Columbia subject headings:
Environmental policy--Economic aspects--Nigeria.
Niger River Delta (Nigeria)--Economic conditions.
Niger River Delta (Nigeria)--Politics and government.
Petroleum industry and trade--Environmental aspects--Nigeria.
Harvard subject headings:
Environmental policy--Economic aspects--Nigeria.
Niger River Delta (Nigeria)--Economic conditions.
Niger River Delta (Nigeria)--Politics and government.
Petroleum industry and trade--Environmental aspects--Nigeria.
Princeton subject headings: