Columbia subject headings:
Harvard subject headings:
Escapes--Germany--History--20th century.
Great Britain. Royal Air Force--History--World War, 1939-1945.
Prisoners of war--Germany--History--20th century
Prisoners of war--Great Britain--History--20th century.
World War, 1939-1945--Prisoners and prisons, German.
Princeton subject headings:
Escapes--Germany--History--20th century.
Great Britain. Royal Air Force--History--World War, 1939-1945.
Prisoners of war--Germany--History--20th century.
Prisoners of war--Great Britain--History--20th century.
World War, 1939-1945--Prisoners and prisons, German.