Columbia subject headings:
Communism--Italy--Congresses.
Partito comunista italiano--Congresses.
Harvard subject headings:
Communism--Italy--Congresses
Partito comunista italiano--Congresses.
Princeton subject headings:
Communism--Italy--Congresses.
Italy--Politics and government--1976-1994--Congresses.
Partito comunista italiano--Congresses.