Columbia subject headings:
Harvard subject headings:
Art--Protection--Europe--History--20th century--Congresses.
Cultural property--Protection--Europe--History--20th century--Congresses.
World War, 1914-1918--Art and the war--Congresses.
Princeton subject headings:
Art--Protection--Europe--History--20th century--Congresses.
Cultural property--Protection--Europe--History--20th century--Congresses.
World War, 1914-1918--Art and the war--Congresses.