Columbia subject headings:
Darling, Donald.
Gibraltar--History.
Spies--Great Britain--Biography.
World War, 1939-1945--Gibraltar.
World War, 1939-1945--Personal narratives, British.
World War, 1939-1945--Secret service--Great Britain.
Harvard subject headings:
Darling, Donald.
Gibraltar--History
Spies--Great Britain--Biography.
World War, 1939-1945--Gibraltar.
World War, 1939-1945--Personal narratives, English.
World War, 1939-1945--Secret service--Great Britain.
Princeton subject headings: