Columbia subject headings:
Egyptians--Sudan--History.
Raḥmah, al-Zubayr, 1831-1913.
Slavery--Sudan.
Sudan--History--1821-1881.
Harvard subject headings:
Egyptians--Sudan--History.
Slavery--Sudan.
Sudan--History--1821-1881.
Sudan--History--1881-1899.
Zubayr Bāshā, 1830-1913.
Princeton subject headings:
Raḥmah, al-Zubayr, 1831-1913.