Columbia subject headings:
Harvard subject headings:
Germans--Europe, Eastern--History--20th century--Congresses.
Jews--Europe, Eastern--History--20th century--Congresses.
Polish people--Europe, Eastern--History--20th century--Congresses.
World War, 1914-1918--Europe, Eastern--Congresses.
World War, 1914-1918--Social aspects--Europe, Eastern--Congresses.
Princeton subject headings:
Germans--Europe, Eastern--History--20th century--Congresses.
Jews--Europe, Eastern--History--20th century--Congresses.
Polish people--Europe, Eastern--History--20th century--Congresses.
World War, 1914-1918--Europe, Eastern--Congresses.
World War, 1914-1918--Social aspects--Europe, Eastern--Congresses.