Columbia subject headings:
Composers--Finland--Correspondence.
Sibelius, Jean, 1865-1957--Childhood and youth.
Sibelius, Jean, 1865-1957--Correspondence.
Harvard subject headings:
Composers--Finland--Correspondence.
Sibelius, Jean, 1865-1957--Childhood and youth.
Sibelius, Jean, 1865-1957--Correspondence.
Princeton subject headings: