Columbia subject headings:
Harvard subject headings:
Concentration camps--France--Congresses.
Concentration camps--Germany--Congresses.
Concentration camps--Netherlands--Congresses.
Holocaust memorials--Congresses.
World War, 1939-1945--Concentration camps--Congresses.
Princeton subject headings:
Holocaust memorials--Congresses.
Nazi concentration camps--France--Congresses.
Nazi concentration camps--Germany--Congresses.
Nazi concentration camps--Netherlands--Congresses.
World War, 1939-1945--Concentration camps--Congresses.