Columbia subject headings:
Schiavi, Alessandro, 1872-1965--Congresses.
Socialism--Italy--History--Congresses.
Harvard subject headings:
Schiavi, Alessandro, 1872-1965--Congresses.
Socialism--Italy--Congresses
Socialism--Italy--History--Congresses.
Princeton subject headings:
Schiavi, Alessandro, 1872-1965--Congresses.
Socialism--Italy--History--Congresses.