Columbia subject headings:
Harvard subject headings:
Dictators--Europe--History--Congresses.
Dictatorship--History--20th century--Congresses.
Europe--Politics and government--20th century--Congresses.
Germany--Politics and government--20th century--Congresses.
Princeton subject headings:
Dictators--Europe--History--Congresses.
Dictatorship--History--20th century--Congresses.
Europe--Politics and government--20th century--Congresses.
Germany--Politics and government--20th century--Congresses.