Columbia subject headings:
Harvard subject headings:
Germany--Foreign relations--Italy--Congresses.
Germany--Relations--Italy--Congresses.
Italy--Foreign relations--Germany--Congresses.
Italy--Relations--Germany--Congresses.
Princeton subject headings:
Germany--Foreign relations--Italy--Congresses.
Germany--Relations--Italy--Congresses.
Italy--Foreign relations--Germany--Congresses.
Italy--Relations--Germany--Congresses.