Papers, including personal and professional correspondence; a heavily annotated copy of A.J.Ayer's 'Thinking and Meaning'; proof copy of J.E.McTaggart's 'Philosophical Studies'; Keeling's work on time and other reviews and articles; reviews of Keeling's own works; draft and proof articles for 'Encyclopaedia Britannica' and related correspondence; Keeling's birth and death certificates and documents relating to his will; 2 letters from Bertrand Russell (photocopies); a photocopy of details of Keeling's imprisonment as a conscientious objector in the First World War.