Columbia subject headings:
Authors, German--20th century--Correspondence.
Kreuder, Ernst, 1903-1972--Correspondence.
Harvard subject headings:
Authors, German--20th century--Correspondence
Kreuder, Ernst, 1903-1972--Correspondence.
Princeton subject headings:
Authors, German--20th century--Correspondence.
Kreuder, Ernst, 1903-1972--Correspondence.