Papers relating to his work as Engineer-in-Chief, South East Asia Command, 1943-1946, dated 1943-1947, principally comprising official photographs showing construction work on roads, bridges and airstrips, 1943-1946; official photograph of Acting Adm Louis (Francis Albert Victor Nicholas) Mountbatten, Supreme Allied Commander South East Asia and US Gen Lewis APick, [1945]; 'The construction of forward airfields in SEAC Areas', Engineer-in-Chief (India) Pamphlet No 12, prepared by Harrison and Maj Gen Horace Eckford Roome, Engineer-in-Chief, General HQ, India, 1945; 'Royal Engineers training memorandum No 20: rafting andbridging', pamphlet issued by the War Office, 1946; 'Memorandum on the training and employment of officers of the Royal Engineers and Indian Engineers in preparation for war', issued by General HQ, Delhi, 1945; letter from Harrison to AQ Plans, South East Asia Command relating to the building of the Ledo Road, Burma and India, Dec 1945; 'Major Engineer: lessons of the war in South East AsiaCommand', copy of unsigned typescript text, [1945]; pre-publication edition of Mountbatten's Report to Combined Chiefs of Staff by the Supreme Allied Commander South East Asia, 1943-1946 (London, 1951), 1947; 'Annexure A', unsigned typescript text on Engineer organisation, South East Asia Command, 1943-1946, written in [1946] and later reworked and published as Annexure 6 of Mountbatten's Report to Combined Chiefs of Staff by Supreme Allied Commander South East Asia, 1943-1946 (London, 1951). Unsigned text of lecture to the Senior Officers' School on organisation and work of Royal Engineers, 31 Dec 1941.