Columbia subject headings:
Composers--Germany--Correspondence.
Mendelssohn-Bartholdy, Felix, 1809-1847--Correspondence.
Harvard subject headings:
Composers--Germany--Correspondence
Composers--Germany--Correspondence--Correspondence.
Mendelssohn-Bartholdy, Felix, 1809-1847--Correspondence.
Princeton subject headings:
Composers--Germany--Correspondence.
Mendelssohn-Bartholdy, Felix, 1809-1847. Correspondence.