Columbia subject headings:
Labor supply--Sudan.
Sudan--Economic conditions.
Sudan--Economic policy.
Working class--Sudan.
Harvard subject headings:
Labor supply--Sudan.
Sudan--Economic conditions.
Sudan--Economic policy.
Working class--Sudan.
Princeton subject headings:
Labor supply--Sudan.
Labor--Sudan.
Sudan--Economic conditions--1973-1983.
Sudan--Economic policy--1973-
Working class--Sudan.