Columbia subject headings:
European federation--History.
Federal government--Europe--History.
Liguria (Italy)--History--19th century.
Liguria (Italy)--History--20th century.
Harvard subject headings:
European federation--History
Federal government--Europe--History.
Liguria (Italy)--History--19th century.
Liguria (Italy)--History--20th century.
Princeton subject headings:
European federation--Congresses.
Federal government--Europe--Congresses.
Liguiria (Italy)--History--Congresses.