Columbia subject headings:
Industrialists--Italy.
Pirelli, Alberto, 1882-1971--Correspondence.
Harvard subject headings:
Diplomats--Italy--Correspondence.
Industrialists--Italy--Correspondence.
Pirelli, Alberto, 1882-1971--Correspondence.
Pirelli, Giovanni--Correspondence.
Princeton subject headings:
Diplomats--Italy--Correspondence.
Industrialists--Italy--Correspondence.
Pirelli, Alberto, 1882-1971--Correspondence.
Pirelli, Giovanni--Correspondence.