Columbia subject headings:
Harvard subject headings:
Dunning, George, 1909-
Escapes
World War, 1939-1945--Prisoners and prisons, German.
World War, 1939-1945--Underground movements.
Princeton subject headings:
Dunning, George, 1909-
Escapes.
World War, 1939-1945--Prisoners and prisons, German.
World War, 1939-1945--Underground movements.