Columbia subject headings:
Kru (African people)--History--19th century.
Migrant labor--Africa, West--History--19th century.
Migrant labor--Liberia--History--19th century.
Harvard subject headings:
Princeton subject headings:
Kru (African people)--History--19th century.
Migrant labor--Africa, West--History--19th century.
Migrant labor--Liberia--History--19th century.