Columbia subject headings:
China--Foreign economic relations--Sudan.
India--Foreign economic relations--Sudan.
International business enterprises--Africa.
Petroleum industry and trade--Sudan.
Sudan--Foreign economic relations--China.
Sudan--Foreign economic relations--India.
Sudan--History--Civil War, 1955-1972.
Harvard subject headings:
China--Foreign economic relations--South Sudan.
China--Foreign economic relations--Sudan.
India--Foreign economic relations--South Sudan.
India--Foreign economic relations--Sudan.
International business enterprises--Africa.
Petroleum industry and trade--South Sudan.
Petroleum industry and trade--Sudan.
South Sudan--Foreign economic relations--China.
South Sudan--Foreign economic relations--India.
Sudan--Foreign economic relations--China.
Sudan--Foreign economic relations--India.
Sudan--History--Civil War, 1955-1972.
Princeton subject headings:
China--Foreign economic relations--Sudan.
India--Foreign economic relations--Sudan.
International business enterprises--Africa.
Petroleum industry and trade--Sudan.
Sudan--Foreign economic relations--China.
Sudan--Foreign economic relations--India.
Sudan--History--Civil War, 1955-1972.