Columbia subject headings:
Barghash ibn Sa'id, Sultan of Zanzibar, approximately 1834-1888--Correspondence.
Zanzibar--Foreign relations--History.
Zanzibar--History.
Harvard subject headings:
Barghash ibn Sa‘īd, Sultan of Zanzibar, approximately 1834-1888.
Princeton subject headings:
Barghash ibn Sa'id, Sultan of Zanzibar, approximately 1834-1888--Correspondence.
Zanzibar--Foreign relations--History.
Zanzibar--History.