Columbia subject headings:
Germany--Emigration and immigration.
Hitler, Adolf, 1889-1945--Assassination attempts--Sources.
Harvard subject headings:
Anti-Nazi movement--Germany
Exiles--Germany.
Hitler, Adolf, 1889-1945--Assassination attempt, 1944 (July 20)--Sources.
Princeton subject headings:
Germans--Foreign countries.
Germany--Emigration and immigration.
Hitler, Adolf, 1889-1945--Assassination attempt, 1944 (July 20)--Sources.