Columbia subject headings:
Forced labor--Germany--History--20th century--Congresses.
Forced labor--Soviet Union--History--Congresses.
Internment camps--Soviet Union--History--Congresses.
Nazi concentration camps--Germany--History--20th century--Congresses.
Nazi concentration camps--Soviet Union--History--Congresses.
World War, 1939-1945--Atrocities--Congresses.
Harvard subject headings:
Concentration camps--Soviet Union--History--Congresses.
Forced labor--Germany--History--20th century--Congresses.
Forced labor--Soviet Union--History--Congresses.
Nazi concentration camps--Germany--History--20th century--Congresses.
World War, 1939-1945--Atrocities--Congresses.
Princeton subject headings:
Forced labor--Germany--History--20th century--Congresses.
Forced labor--Soviet Union--History--Congresses.
Internment camps--Soviet Union--History--Congresses.
Nazi concentration camps--Germany--History--Congresses.
World War, 1939-1945--Atrocities--Congresses.