Columbia subject headings:
Tanzania--Economic conditions.
Tanzania--History--1803-1900.
Tanzania--History--20th century.
Harvard subject headings:
Agriculture--Economic aspects--Tanzania--History--20th century.
Tanzania--Economic conditions--1964-
Tanzania--Economic conditions--To 1964.
Tanzania--Social conditions.
Princeton subject headings:
Tanzania--Economic conditions.
Tanzania--History--1803-1900.
Tanzania--History--20th century.