Columbia subject headings:
Europe, Eastern--Foreign relations--Congresses.
Europe, Eastern--Politics and government--1918-1945--Congresses.
Harvard subject headings:
Europe, Eastern--Foreign relations--Congresses.
Europe, Eastern--Politics and government--1918-1945--Congresses.
Princeton subject headings:
Europe, Central--Politics and government--20th century--Congresses.
Europe, Eastern--Politics and government--1918-1945--Congresses.
Europe--Politics and government--1918-1945--Congresses.