Columbia subject headings:
Ibn Saʻīd, Barghash Sultan of Zanzibar, 1837-1888--Journeys.
Zanzibar--History--to 1890.
Harvard subject headings:
Ibn Saʻīd, Barghash Sultan of Zanzibar, 1837-1888--Journeys.
Zanzibar--History--To 1890.
Princeton subject headings: