Columbia subject headings:
Bobbio, Norberto, 1909-2004--Correspondence.
Solari, Gioele, 1872-1952--Correspondence.
Harvard subject headings:
Bobbio, Norberto, 1909-2004--Correspondence.
Solari, Gioele, 1872-1952--Correspondence.
Princeton subject headings:
Bobbio, Norberto, 1909-2004--Correspondence.
Solari, Gioele, 1872-1952--Correspondence.