Columbia subject headings:
Leitner, Ferdinand--Correspondence.
Orff, Carl, 1895-1982--Correspondence.
Harvard subject headings:
Leitner, Ferdinand--Correspondence.
Orff, Carl, 1895-1982--Correspondence.
Princeton subject headings:
Leitner, Ferdinand--Correspondence.
Orff, Carl, 1895-1982--Correspondence.