Columbia subject headings:
Authors, Italian--20th century--Congresses.
Levi, Carlo, 1902-1975--Congresses.
Harvard subject headings:
Authors, Italian--20th century--Congresses
Levi, Carlo, 1902-1975--Congresses.
Princeton subject headings:
Authors, Italian--20th century--Congresses.
Levi, Carlo, 1902-1975--Congresses.