Papers of Gen Sir Frederick Campbell, 1878-1932, chiefly relating to Tibet and the North West Frontier, including plan of route taken by the Younghusband Expedition from Siliguri, Bengal, India to Lhasa, Tibet, showing altitudes and sites of skirmishes, 1904; transcript of a lecture entitled 'Reminiscences of Tibet'; photographs including from the Tibet expedition, 1904; monasteries; bridge; British officers; Tibetan houses; a wall painting; 3 Rolls Royce armoured cars, Sep 1915; defeated Afghan troops; moveable column, 1914; aerial photograph of a Fort, 18 Feb 1916; Dargai Mountain, showing area held by Afridis, Tirah campaign, North West Frontier, 1898; 'route along which assault [British on Afridis] was made' and British officer with [Indian] troops; photograph album labelled 'Tibet 1904, Siliguri to Gyantse and Lhasa, 24 May – 8 July snapshots taken by J H Moody 40th Pathans' including photographs of camps with pitched tents, British officers, views of mountain peaks, troops in mountain passes, camp furniture, Mount Chomolhari, camp at Tuna, Tibet, game of hockey at Tuna, (40 Pathans versus 23 Pioneers), camp at [Khangma], Tibet, views of Niani, Tibet, Gyantse, street scene and British officer and Indian troops with objects taken from a monastery; correspondence including personal letters, 1912-1919, chiefly congratulations on operations, North West Frontier, Sep 1915, and on Campbell’s promotion to General, 1919; correspondence relating to morale among troops of 1 (Peshawar) Div, 1918-1919; on defence of North West Frontier Province, India, World War One, 1928 and 1931-1932 and on 1 Div, 1919-1936; reports including on action at Hafiz Kor, North West Frontier [now Pakistan], 5 Sep 1915, by Campbell as General Officer Commanding 1 (Peshawar) Div; on operations on Swat, Buner and Mohmand borders, 19 Jun – 27 Oct 1915; by Campbell as General Officer Commanding 1 Div on 'Charsadda Raid and roundup, 7-8 Dec 1915'; report on operations in Swat, 28-29 Aug and 27 Oct 1915; report on operations in Buner, 17, 26 and 31 Aug 1915 and report on casualties, 1913-1915; certificates, 1878-1898 including Campbell’s certificate of DSO, 1898; press cuttings; Campbell’s accounts of his military service, 1926; notes on Campbell’s medals and record of active service.

Papers, 1898-1900, 1916-1945, of Brig Gen Percy Robert Clifford Groves, mainly comprising material on the development of aviation policy and the evolution of the Royal Air Force in the interwar period, and also including material on the Royal Flying Corps in the Middle East during World War One. The papers include Groves' Boer war diary, 1900; photographs of operations of 'C' flight No 17 Squadron in the Sudan, undated [1916]; report on arrangements for No 17 Squadron Royal Flying Corps and the Aircraft Park allotted to the Salonika Army, 1916; lecture on the organisation and work of the Royal Flying Corps, 1917, and related papers; papers relating to the Air Section of the British Delegation of the Inter Allied Aeronautical Commission of Control (Commission Interalliée de Controle Aeronautique), 1919-1922; minutes of the Committee of Enquiry on the Air League of the British Empire, 1926-1927, and associated correspondence; papers relating to publications by Groves on aviation matters, 1927-[1938], including vols I and II of the periodical Air , 1927-1929, reviews and cuttings for Behind the smoke screen [1934] and Our future in the air [1935], and a further survey of air power, This Air Business [1938], which went unpublished owing to the outbreak of World War Two. Personal papers include Groves' commissions in the militia and land forces, 1898-1899; photographs relating to Groves' attendance at the Versailles peace conference (1919-1920); papers relating to promotion, 1919-1924; financial papers; press cuttings on public affairs to 1945.

Papers relating to his role in the development and production of armoured fighting vehicles, dated 1914-1959, 1964, 1994, principally comprising correspondence, memoranda and minutes relating to the Landships Committee, 1915-1916, and the Tank Supply Committee, Tank Supply Department (later Mechanical Warfare Supply Department) and Mechanical Warfare (Overseas and Allies) Department, 1916-1918; progress reports and memoranda on design and construction of landships, 1915; plans, drawings and blueprints for landships and tanks, 1915-1916; 'Notes on the employment of tanks' by Col Ernest Dunlop Swinton, printed at the Foreign Office, 1916; 'Mechanical warfare, a summary of British tank development, 1914-1918', typescript text by Stern, [1925]; papers relating to the establishment of the Allied Tank Factory at Neuvy Pailloux, Chateauroux, France, dated 1917-1918; notes and reports by Lt J Rackham and George Watson relating to the use of tanks on the Western Front, 1917; 'The tactical employment of tanks in 1918', unofficial report by Col John Frederick Charles Fuller, 1917; correspondence and memoranda relating to Ministry of Supply Special Vehicle Development Committee and the Tank Board, 1939-1943, and the design and development of TOG heavy tanks, 1939-1944 ['TOG' - The Old Gang, informal name for Special Vehicle Development Committee members, some of whom had worked on tank development during World War One], including correspondence with Rt Hon Edward Leslie Burgin, Minister of Supply, 1939-1940, Rt Hon Herbert Stanley Morrison, Minister of Supply, 1940, Rt Hon Sir Andrew Rae Duncan, Minister of Supply, 1940-1941 and 1942, Rt Hon William Maxwell Aitken Beaverbrook, 1st Baron Beaverbrook, Minister of Supply, 1941-1942, Sir James Lithgow, Chairman of the Tank Board, 1941, and Rt Hon Winston (Leonard Spencer) Churchill 1940-1942, Prime Minister, First Lord of the Treasury and Minister of Defence, Sir William Tritton of Tritton, Foster and Co, and Cdr R H Stokes-Rees, 1943-1944; official reports by Lt Col Gordon Hall on British and Italian use of tanks in the Middle East, 1940-1941, dated 1941; specifications and technical reports relating to tanks, 1939-1944; minutes of Special Vehicle Development Committee, 1939-1942; papers relating to investigation of Stern's position in the Ministry of Supply, 1942, dated 1939-1942, including transcriptions of interviews with Stern, 1942; correspondence and memoranda relating to Stern's evidence before the Sub-Committee on National Production and Supply of the House of Commons Select Committee on National Expenditure; publications and printed material relating to tanks, 1915-1919, 1939-1946, 1959; photographs, 1915-1918, 1939-1945, principally comprising British, French and Canadian photographs of tanks, 1915-1918; photographs of TOG tanks, 1939-1942; films concerning the development of the tank, 1918, 1941-1942, 1957. Other papers relating to his life and career, notably including photographs relating to his service with the Royal Naval Air Service, 1914-1915; copies of personal correspondence, 1918-1919.