Columbia subject headings:
Europe--Politics and government--1945---Congresses.
European federation--History--Congresses.
Spinelli, Altiero--Congresses.
Harvard subject headings:
Europe--Politics and government--1945---Congresses.
European federation--History--Congresses.
Spinelli, Altiero--Congresses.
Princeton subject headings:
Europe--Politics and government--1945---Congresses.
European federation--History--Congresses.
Spinelli, Altiero--Congresses.