Columbia subject headings:
Dictatorship--Germany--History--20th century--Congresses.
Dictatorship--Poland--History--20th century--Congresses.
Germany--Foreign relations--Poland--20th century--Congresses.
Germany--Politics and government--20th century--Congresses.
Poland--Foreign relations--Germany--20th century--Congresses.
Poland--Politics and government--20th century--Congresses.
Harvard subject headings:
Dictatorship--Germany--History--Congresses.
Dictatorship--Poland--History--Congresses.
Germany--Foreign relations--Poland--Congresses.
Germany--Politics and government--Congresses.
Poland--Foreign relations--Germany--Congresses.
Poland--Politics and government--Congresses.
Princeton subject headings:
Dictatorship--Germany--History--Congresses.
Dictatorship--Poland--History--Congresses.
Germany--Foreign relations--Poland--Congresses.
Germany--Politics and government--Congresses.
Poland--Foreign relations--Germany--Congresses.
Poland--Politics and government--Congresses.