Columbia subject headings:
Europe--History--1918-1945--Congresses.
Internment camps in art--Congresses.
Nazi concentration camps in art--Congresses.
Prisoners as artists--Europe--Congresses.
Prisoners of war--Europe--History--20th century--Congresses.
World War, 1939-1945--Concentration camps--Congresses.
World War, 1939-1945--Prisoners and prisons, German--Congresses.
Harvard subject headings:
Prisoners as artists--Congresses.
Prisoners of war in art--Congresses.
World War, 1939-1945--Prisoners and prisons, German--Congresses.
Princeton subject headings:
Prisoners as artists--Congresses.
Prisoners of war in art--Congresses.
World War, 1939-1945--Prisoners and prisons, German--Congresses.