Columbia subject headings:
Anti-Nazi movement--History.
Germany--History--1933-1945.
Hitler, Adolf, 1889-1945--Assassination attempts.
Harvard subject headings:
Anti-Nazi movement--History.
Germany--History--1933-1945.
Hitler, Adolf, 1889-1945--Assassination attempt, 1944 (July 20)
Princeton subject headings:
Anti-Nazi movement--History.
Germany--History--1933-1945.
Hitler, Adolf, 1889-1945--Assassination attempts.