Loose-leaf ring binder of correspondence, August 1970-May 1971. Letters are numbered as follows: DS I (New Series) (including correspondence with N. Belnap, C. Böhm), DS II (including correspondence with E. Engeler, C. Wadsworth, and Scott's manuscript.), CS I (New Series) (including Strachey's manuscript on Jumps), CS II, CS III, DS IV (including correspondence with L. Smullin), CS IV, CS V, DS V, DS III, DS VI, CS VI, DS VII, CS VII, CS VIII (including circulation lists for papers), DS VIII, CS IX, CS X, DS unnumbered (including correspondence with J. Fox)