Columbia subject headings:
Busch, Ernst, 1900-1980--Correspondence.
Kipphardt, Heinar, 1922-1982--Correspondence.
Harvard subject headings:
Actors--Germany--Correspondence.
Authors, German--20th century--Correspondence
Busch, Ernst, 1900-1980--Correspondence.
Kipphardt, Heinar, 1922-1982--Correspondence.
Singers--Germany--Correspondence.
Princeton subject headings:
Actors--Germany--20th century--Correspondence.
Authors, Germany--20th century--Correspondence.
Busch, Ernst, 1900-1980--Correspondence.
Kipphardt, Heinar, 1922-1982--Correspondence.
Singers--Germany--20th century--Correspondence.