Columbia subject headings:
Harvard subject headings:
Howard, W. Stephen--Religion.
Howard, W. Stephen--Travel--Sudan.
Ikhwān al-Jumhūrīyūn
Islam--Sudan--History--20th century.
Sudan--Politics and government--1956-1985
Sudan--Social life and customs--20th century.
Sufism--Sudan--History--20th century.
Princeton subject headings:
Howard, W. Stephen--Religion.
Howard, W. Stephen--Travel--Sudan.
Ikhwān al-Jumhūrīyūn.
Islam--Sudan--History--20th century.
Sudan--Politics and government--1956-1985.
Sudan--Social life and customs--20th century.
Sufism--Sudan--History--20th century.