Columbia subject headings:
Sudan--History--1821-1881.
Sudan--History--1899-1956.
ʻUthmān Abū Bakr Diqnah, approximately 1840-1926.
Harvard subject headings:
Sawākin (Sudan)--History.
Sudan--History, Military.
Sudan--History--1821-1881.
Sudan--History--1881-1899.
Sudan--History--1899-1956
ʻUthmān Abū Bakr Diqnah, approximately 1840-1926.
Princeton subject headings: