Columbia subject headings:
Authors, German--20th century--Correspondence.
Ernst, Paul, 1866-1933--Correspondence.
Vesper, Will, 1882-1962--Correspondence.
Harvard subject headings:
Authors, German--20th century--Correspondence
Ernst, Paul, 1866-1933--Correspondence.
Vesper, Will, 1882-1962--Correspondence.
Princeton subject headings:
Authors, German--20th century--Correspondence.
Ernst, Paul, 1866-1933--Correspondence.
Vesper, Will, 1882-1962--Correspondence.