(Extracts from) letters to P. H. Newby, Helen Rapp and John Walker on IB's Mellon Lectures
Letters to Alain Besançon and Piero Gastaldo on Joseph de Maistre, and to Geert Van Cleemput on nationalism
(Extracts from) letters (see below), collected in the appendix to Against the Current (2nd ed., 2013)
‘Made of Wax after All’: (extracts from) letters to Henry Hardy, on whether to publish what became Concepts and Categories
(Extracts from) letters to Leon Edel, R. Errera, the editor of the New York Review of Books, Lincoln Schuster, H. Paul Simon, Shiela Sokolov Grant and Edmund Wilson
‘My Philosophical Views’ (first draft of Bib.229), in the appendix to
‘Hamann’s Origins’ (1965)
‘Democracy, Communism and the Individual’
Building: Letters 1960–1975, ed. Henry Hardy and Mark Pottle (London, 2013: Chatto and Windus; London, 2016: Pimlico)
‘M. Henri Heine’ (poem written in 1928), in Arie M. Dubnov, Isaiah Berlin: The Journey of a Jewish Liberal (London, 2012: Palgrave Macmillan), 48, with extensive commentary (48–52)