Lieutenant-Colonel Fleming Mackenzie of the 1st Battalion of the Fifteenth Punjab Regiment commanded the Escort to the Trade Agent in Tibet in 1938-1939. This material contains original diaries written whilst in Tibet, later typed drafts of these diaries, essays written about his experiences, hand-drawn maps and other material associated with his visit.

A small notebook containing diary entries from 23 June 1939 - 8 March 1940. Mackenzie notes that on 10th August 1939, Professor G. Tucci visited who he writes is 'probably the world's best Tibetan scholar' and who he continued to meet with in the succeeding days. Alongside the entries of his own life are comments on the world news including the start of WW II. The regiment returned to Kolkata on 10th October 1939 and the diary entries subsequently contain information about his social life as well as war news and the death of Jemi Bikram Singh. He received authority for leave home on 19th December 1939 and travelled from Dum Dum to Jodhpur with Air France on 24 December, flew to Basra the following day and arrived in Baghdad on the 26th December. From there he went to Tunis and then Paris and reached England on 29 December 1939 when he returned to his wife to find her still poorly from pneumonia. The entry for 29th January 1940 contains three sketches made on his journey to London.

Small notebook containing diary entries from 16 November 1938 - 21 February 1939. The entry for 21 December 1938 includes a sketch of an ice boat. The diary also includes a typed list of Germans who arrived at their camp on 8 January 1939 and a description of them within that day's diary entry. The entries contain both official and personal information.