Columbia subject headings:
Harvard subject headings:
Anti-Nazi movement--Germany--Biography
Hagen, Albrecht von, 1904-1944--Family.
Hagen, Albrecht von, 1904-1944.
Hitler, Adolf, 1889-1945--Assassination attempt, 1944 (July 20)
Hitler, Adolf, 1889-1945--Assassination attempt, 1944 (July 20)--Sources.
Princeton subject headings:
Anti-Nazi movement--Germany--Biography.
Hagen, Albrecht von, 1904-1944--Family.
Hagen, Albrecht von, 1904-1944.
Hitler, Adolf, 1889-1945--Assassination attempt, 1944 (July 20)--Sources.
Hitler, Adolf, 1889-1945--Assassination attempts.