Columbia subject headings:
Harvard subject headings:
Fraternal organizations--Europe--History--Congresses.
Fraternal organizations--Italy--History--Congresses.
Mutualism--Europe--History--Congresses.
Mutualism--Italy--History--Congresses.
Princeton subject headings:
Fraternal organizations--Europe--History--Congresses.
Fraternal organizations--Italy--History--Congresses.
Mutualism--Europe--History--Congresses.
Mutualism--Italy--History--Congresses.