Columbia subject headings:
Europe--Politics and government--Congresses.
Federal government--Congresses.
Federal government--Europe--History--Congresses.
Federal government--Italy--History--Congresses.
Italy--Politics and government--1870---Congresses.
Harvard subject headings:
Europe--Politics and government--Congresses.
Federal government--Congresses
Federal government--Europe--History--Congresses.
Federal government--Italy--History--Congresses.
Italy--Politics and government--1870---Congresses.
Princeton subject headings: