Columbia subject headings:
Coastwise shipping--Tanzania--Zanzibar--History--19th century.
Coastwise shipping--Tanzania--Zanzibar--History--20th century.
Dhows--Tanzania--Zanzibar--History--19th century.
Dhows--Tanzania--Zanzibar--History--20th century.
Zanzibar--Commerce--History--19th century.
Zanzibar--Commerce--History--20th century.
Zanzibar--Economic conditions--To 1964.
Harvard subject headings:
Coastwise shipping--Tanzania--Zanzibar--History--19th century.
Coastwise shipping--Tanzania--Zanzibar--History--20th century.
Commerce--Tanzania--Zanzibar--History--19th century.
Commerce--Tanzania--Zanzibar--History--20th century.
Dhows--Tanzania--Zanzibar--History--19th century.
Dhows--Tanzania--Zanzibar--History--20th century.
Zanzibar--Commerce--History--19th century.
Zanzibar--Commerce--History--20th century.
Zanzibar--Economic conditions--To 1964.
Princeton subject headings:
Coastwise shipping--Zanzibar--History--19th century.
Coastwise shipping--Zanzibar--History--20th century.
Commerce--Zanzibar--History--19th century.
Commerce--Zanzibar--History--20th century.
Dhows--Zanzibar--History--19th century.
Dhows--Zanzibar--History--20th century.
Zanzibar--Economic conditions--To 1964.