Columbia subject headings:
Foreign workers--Africa, Southern--History--20th century.
Labor policy--Africa, Southern--History--20th century.
Migrant labor--Africa, Southern--History--20th century.
Harvard subject headings:
Foreign workers--Africa, Southern--History--20th century.
Labor policy--Africa, Southern--History--20th century.
Migrant labor--Africa, Southern--History--20th century.
Princeton subject headings:
Foreign workers--Africa, Southern--History--20th century.
Labor policy--Africa, Southern--History--20th century.
Migrant labor--Africa, Southern--History--20th century.