Columbia subject headings:
Composers--Germany--Correspondence.
Pfitzner, Hans, 1869-1949--Correspondence.
Harvard subject headings:
Composers--Germany--Correspondence
Pfitzner, Hans Erich, 1869-1949--Correspondence.
Pfitzner, Hans, 1869-1949--Correspondence.
Princeton subject headings:
Composers--Germany--Correspondence.
Pfitzner, Hans Erich, 1869-1949--Correspondence.