Columbia subject headings:
Harvard subject headings:
Austrians--Great Britain--Biography.
Germans--Great Britain--Biography.
Great Britain. Special Operations Executive--History.
Intelligence officers--Great Britain--Biography.
World War, 1939-1945--Secret service--Great Britain.
World War, 1939-1945--Underground movements--Austria.
Princeton subject headings:
Great Britain. Special Operations Executive--History.
Intelligence officers--Great Britain--Biography.
World War, 1939-1945--Secret service--Great Britain.
World War, 1939-1945--Underground movements--Austria.