Columbia subject headings:
Foreign workers, Chinese--History--20th century.
World War, 1914-1918--Conscript labor--Europe.
Harvard subject headings:
Foreign workers, Chinese--History--20th century--Sources.
World War, 1914-1918--Sources
Princeton subject headings:
Foreign workers, Chinese--History--20th century.
World War, 1914-1918--Conscript labor--Europe.