Columbia subject headings:
Harvard subject headings:
Europe--Emigration and immigration--History--20th century--Congresses.
Exiles--Europe--History--20th century--Congresses.
Jews--Persecutions--Europe--History--20th century--Congresses.
Refugees--Europe--History--20th century--Congresses.
World War, 1939-1945--Refugees--Congresses.
Princeton subject headings:
Europe--Emigration and immigration--History--20th century--Congresses.
Exiles--Europe--History--20th century--Congresses.
Jews--Persecutions--Europe--History--20th century--Congresses.
Refugees--Europe--History--20th century--Congresses.
World War, 1939-1945--Refugees--Congresses.