Columbia subject headings:
Harvard subject headings:
Poland--History--Occupation, 1939-1945--Congresses.
Prisoners of war--Germany--History--20th century--Congresses.
Soviet Union--History--German occupation, 1941-1944--Congresses.
World War, 1939-1945--Campaigns--Eastern Front--Congresses.
World War, 1939-1945--Campaigns--Soviet Union--Congresses.
World War, 1939-1945--Conscript labor--Germany--Congresses.
World War, 1939-1945--Prisoners and prisons, Soviet--Congresses.
Princeton subject headings:
Germany--Armed Forces--History--20th century--Congresses.
Prisoners of war--Soviet Union--Congresses.
Soviet Union--History--German occupation, 1941-1944--Congresses.
World War, 1939-1945--Atrocities--Congresses.
World War, 1939-1945--Prisoners and prisons, German--Congresses.