Columbia subject headings:
Harvard subject headings:
Forced labor--Germany--Berlin--History--20th century--Congresses.
Forced labor--Germany--Brandenburg--History--20th century--Congresses.
World War, 1939-1945--Conscript labor--Germany--Berlin--Congresses.
World War, 1939-1945--Conscript labor--Germany--Brandenburg--Congresses.
World War, 1939-1945--Prisoners and prisons, German--Congresses.
Princeton subject headings:
Forced labor--Germany--History--20th century--Congresses.
World War, 1939-1945--Conscript labor--Germany--Berlin--Congresses.
World War, 1939-1945--Conscript labor--Germany--Brandenburg--Congresses.