Columbia subject headings:
Authors, German--Correspondence.
Böll, Heinrich, 1917-1985--Correspondence.
Kopelev, Lev, 1912-1997--Correspondence.
Harvard subject headings:
Authors, German--Correspondence
Böll, Heinrich, 1917-1985--Correspondence.
Kopelev, Lev, 1912-1997--Correspondence.
Princeton subject headings: