Columbia subject headings:
World War, 1939-1945--Concentration camps--Germany.
Harvard subject headings:
Concentration camps--Germany--Congresses.
World War, 1939-1945--Concentration camps--Germany--Congresses.
Princeton subject headings:
Germany--History--1933-1945--Congresses.
National socialism--Congresses.
Nazi concentration camps--Germany--Congresses.
Political prisoners--Germany--History--20th century--Congresses.