Columbia subject headings:
Harvard subject headings:
Exploitation--History--Congresses.
Forced labor--History--Congresses.
National socialism and labor--Congresses.
Slave labor--History--Congresses.
World War, 1939-1945--Conscript labor--Germany--Congresses.
Princeton subject headings:
Exploitation--History--Congresses.
Forced labor--History--Congresses.
National socialism and labor--Congresses.
Slave labor--History--Congresses.
World War, 1939-1945--Conscript labor--Germany--Congresses.