Columbia subject headings:
Ardennes, Battle of the, 1944-1945.
Escapes--Great Britain--History--20th century.
Prisoners of war--Germany.
Prisoners of war--Great Britain.
Subversive activities--England--London.
World War, 1939-1945--Prisoners and prisons, British.
Harvard subject headings:
Ardennes, Battle of the, 1944-1945.
Escapes--Great Britain--History--20th century.
Prisoners of war--Germany
Prisoners of war--Great Britain
Subversive activities--England--London.
World War, 1939-1945--Prisoners and prisons, British.
Princeton subject headings:
Ardennes, Battle of the, 1944-1945.
World War, 1939-1945.