Columbia subject headings:
Executive departments--United States--Records and correspondence.
United States--Foreign relations--Tanzania--Zanzibar.
United States--History--Sources.
Zanzibar--Foreign relations--United States.
Zanzibar--History--Sources.
Harvard subject headings:
Princeton subject headings:
Executive departments--United States--Records and correspondence.
United States--Foreign relations--Zanzibar.
United States--History--Sources.
Zanzibar--Foreign relations--United States.
Zanzibar--History--Sources.