Columbia subject headings:
Feudalism--Italy, Central--History--Congresses.
Italy, Central--Ethnic relations--Congresses.
Jews--Italy, Central--History--Congresses.
Harvard subject headings:
Feudalism--Italy, Central--History--Congresses.
Italy, Central--Ethnic relations--Congresses.
Jews--Italy, Central--History--Congresses.
Jews--Italy--History--Congresses.
Princeton subject headings:
Feudalism--Italy, Central--History--Congresses.
Italy, Central--Ethnic relations--Congresses.
Jews--Italy, Central--History--Congresses.