Columbia subject headings:
Biella (Italy)--Biography.
Buenos Aires (Argentina)--Biography.
Immigrants--Argentina--Correspondence.
Italians--Argentina--Buenos Aires--Correspondence.
Solá family--Correspondence.
Harvard subject headings:
Biella (Italy)--Biography.
Buenos Aires (Argentina)--Biography.
Immigrants--Argentina--Correspondence.
Italians--Argentina--Buenos Aires--Correspondence.
Solá family--Correspondence.
Princeton subject headings: