Columbia subject headings:
Leer, Sophie van, 1892-1953--Correspondence.
Runge, Wilhelm--Correspondence.
Harvard subject headings:
Authors, Dutch--20th century--Correspondence
Leer, Sophie van, 1892-1953--Correspondence.
Poets, German--20th century--Correspondence.
Runge, Wilhelm--Correspondence.
Princeton subject headings:
Leer, Sophie van, 1892-1953--Correspondence.
Runge, Wilhelm--Correspondence.