Fragmentary diary including cuttings and annotated circular concerning lecture series organised by the French Delegation in Nagpur in which Datta took part.
Diary, 19 Oct 1918-22 Aug 1936 [fragmentary for 1920-25]; with notes on the Lindsay Commission 1931 and miscellaneous notes for 1931 and 1932; also small 'Silent Messenger' pamphlet entitled The Drift of the Times. Sound the Alarm! The Spiritual Poison of the Y.M.C.A. (Kansas City).
Diary, 3 Jan-5 Nov 1915, with preceding entries for 30 Oct-18 Nov 1912. [Inserted at 30 Aug 1915 letters from L.F. Perkin, 22 Jun and J.C.R. Ewing, 6 Aug and at 9 Dec a letter from J.E. Shukle, 10 Sep].