Columbia subject headings:
Guilds--Italy--History--Congresses.
Mutualism--Italy--History--Congresses.
Universities and colleges--Italy--History--Congresses.
Harvard subject headings:
Guilds--Italy--History--Congresses.
Mutualism--Italy--History--Congresses.
Universities and colleges--Italy--History--Congresses.
Princeton subject headings:
Guilds--Italy--History--Congresses.
Mutualism--Italy--History--Congresses.
Universities and colleges--Italy--History--Congresses.