Handwritten and typed diary entries relating to Lester' time as Deputy Secretary General of the League of Nations in Geneva. Includes copy letters from Lester to: Joseph Avenol, Secretary General of the League of Nations, and RM Smyllie, editor of the Irish Times. Includes letters to Lester from: Daniel Anthony Binchy, University College Dublin lecturer and former Irish diplomat; John Marcus O' Sullivan, TD, academic and former member of the Irish delegation to the League of Nations; Alfred O’Rahilly, professor of mathematical physics at University College Cork, mainly concerning the potential promotion of O’Rahilly's new book Electromagnetics: A Discussion of Fundamentals in Switzerland; James Cousins, Irish writer and lecturer at the University of Travancore, India. Includes copy letters from: Arthur Sweetser to [?Lewis Lerwin] in the USA;, and HR Cummings, London representative of the League of Nations Secretary General, to Joseph Avenol. Also includes a list of names and occupations of individuals in the museum sector who attended at luncheon on 8 March [?1939].