Columbia subject headings:
Harvard subject headings:
Espionage.
Redl, Alfred, 1864-1913.
Spies--Austria--Biography.
Spies--Russia--Biography.
Princeton subject headings:
Austria--Armed Forces--Officers--Biography.
Austria--History--1867-1918.
Espionage,Soviet--Austria.
Espionage.
Redl, Alfred, 1864-1913.