Columbia subject headings:
Egypt--Foreign relations--Sudan.
Sudan--Foreign relations--Egypt.
Sudan--Politics and government.
Harvard subject headings:
Egypt--Foreign relations--Sudan.
Sudan--Foreign relations--Egypt.
Sudan--History--1821-1881.
Sudan--History--1881-1899.
Princeton subject headings:
Egypt--Foreign relations--Sudan.
Sudan--Foreign relations--Egypt.
Sudan--History--1821-1881.
Sudan--History--1881-1899.