Columbia subject headings:
Forced labor--Germany--Bonn--History--20th century.
Foreign workers--Germany--Bonn--History--20th century.
World War, 1939-1945--Conscript labor--Germany--Bonn.
Harvard subject headings:
Bonn (Germany)--History--20th century.
Forced labor--Germany--Bonn--History--20th century.
Foreign workers--Germany--Bonn--History--20th century.
World War, 1939-1945--Conscript labor--Germany--Bonn.
Princeton subject headings:
Bonn (Germany)--History--20th century.
Forced labor--Germany--Bonn--History--20th century.
Foreign workers--Germany--Bonn--History--20th century.
World War, 1939-1945--Conscript labor--Germany--Bonn.