Diaries, 1901-1968; papers and photograph albums relating to the Boer War and photography in military reconnaissance, including an unpublished manuscript, 1897-1902, service in Northern Nigeria on the Anglo-French Boundary Commission, 1902-1904, West Africa, 1903, West Indies, 1902 and Ordnance Survey of Scotland, 1904-1909; papers relating to the introduction and use of chemical warfare during World War One, 1914-1918, and on the North West Frontier, India, 1919-1920 andphotographs taken on the Western Front, 1914-1915 and 1919; articles written as Director of Irish Propaganda during the Anglo-Irish War, 1921; papers concerning appointments as Colonel Commandant and Representative Colonel Commandant, 1937-1944; papers concerning writing and publication of 'Gas!' The story of the Special Brigade (Blackwoods, 1934) and Commonsense and ARP (C Arthur Pearson, 1939) and draft chapters and photographs concerning the unpublished manuscript 'Adventures of an Engineer Subaltern' dealing with military career, 1897-1903; personal correspondence and papers relating to memorial service, 1900-1981; glass and film negatives covering career, 1897-1920.