Columbia subject headings:
Crockatt, N. R.
Escapes.
World War, 1939-1945--Prisoners and prisons, German.
World War, 1939-1945--Secret service--Great Britain.
Harvard subject headings:
Princeton subject headings:
Crockatt, N. R.
Escapes.
World War, 1939-1945--Prisoners and prisons, German.
World War, 1939-1945--Secret service--Great Britain.