Columbia subject headings:
Harvard subject headings:
Authors, German--20th century--Correspondence
Schleef, Einar, 1944-2001--Correspondence.
Schleef, Gertrud, 1909-1993--Correspondence.
Princeton subject headings:
Authors, German--20th century--Correspondence.
Schleef, Einar, 1944-2001--Correspondence.
Schleef, Gertrud, 1909-1993--Correspondence.