Columbia subject headings:
Böll, Heinrich, 1917-1985--Correspondence.
Celan, Paul--Correspondence.
Schallück, Paul, 1922-1976--Correspondence.
Schroers, Rolf, 1919-1981--Correspondence.
Harvard subject headings:
Böll, Heinrich, 1917-1985--Correspondence.
Celan, Paul--Correspondence.
Schallück, Paul, 1922-1976--Correspondence.
Schroers, Rolf, 1919-1981--Correspondence.
Princeton subject headings:
Böll, Heinrich, 1917-1985--Correspondence.
Celan, Paul--Correspondence.
Schallück, Paul, 1922-1976--Correspondence.
Schroers, Rolf, 1919---Correspondence.