Photocopies of correspondence and photographs, taken from five albums, relating to Sclater's career, 1898-1927, including letter from FM Sir (Henry) Evelyn Wood, Adjutant General to the Forces, confirming Sclater's appointment as Bde Maj, Aldershot, 1898; seventeen copies of photographs and nine sketch maps relating to the Second Boer War, South Africa, 1899-1902, including photographs of Bloemfontein and Brandfort, Orange Free State, and sketch maps of the Battles of Modder River, Nov 1899 and Paardeberg Drift, Feb 1900; two photographs of the 13 pounder Quick Fire gun, newly issued to the Royal Horse Artillery, 1904; letter from Lt Col Rt Hon Arthur John Bigge, 1st Baron Stamfordham, thanking Sclater for congratulatory letter on the award of a peerage to Stamfordham, 1911; three photographs of Indian Army sepoys, 1912; correspondence, 1912- 1917, including letters relating to recruitment, military inspections and the availability of manpower from FM Sir John Denton Pinkstone French, Commander-in-Chief, Home Forces, Feb 1917, Gen Sir (Henry Macleod) Leslie Rundle, General Officer Commanding-in-Chief, Eastern Command, Feb-May 1916, and Lt Gen Sir (Cecil Frederick) Nevil Macready, Adjutant General to the Forces, Jul 1917; letter to Slater from Gen Sir (Francis) Reginald Wingate, relating to riots in Egypt, Jun 1920; letter to Sclater from Lt Gen Sir George Fletcher MacMunn, Quartermaster General, India, dated Jun 1921, relating to the political and military situation in India, particularly in the aftermath of the massacre of 479 Indian civilians by troops of the Indian Army, commanded by Brig Gen Reginald Edward Harry Dyer, Amritsar, Punjab, Apr 1919; printed obituary of Sclater [1927].

Microfilm copies of papers relating to his naval career, 1942-1946, principally comprising 'Africa Navy blues', an illustrated account of his experiences in the RN, 1942-1946, written in 1946, covering his service on HMS BIRMINGHAM in a convoy from Egypt to Malta (Operation VIGOROUS), June 1942, and on anti-submarine trawlers in the Bay of Bengal, 1942, during the Allied invasion of Madagascar, 1942, and in South Africa, 1942-1945; diary, 1943-1945. 'War time trawler', a transcript of a broadcast by James McClurg of the South African Broadcasting Corporation concerning his experiences on board an anti-submarine trawler during World War Two, written in [1940-1945].

Unpublished typescript memoirs, 1893-1969, including: accounts of life in the British colony in St Petersburg before World War One; work in the British Military Mission at the Russian War Office; events witnessed during the Russian Revolution and conditions for the Russian Army during the Revolution, 1917-1918; evacuation of British personnel from Russia, February 1918; negotiating with Finnish Red and White commanders while travelling through Finland during the Civil War; liaising with Admiral Aleksandr Vasiliyevich Kolchak and the White armies in Harbin, China, 1918; liaising with General Mikhail Konstantinovich Dieterichs, Czechoslovak Legions, and a special mission to Ataman Grigory Mikhaylovich Semyonov (or Semenov) in Chita, Transbaikalia, November 1918; activities as General Sir Harry Knox's liaison officer at the White Army Headquarters in Omsk, November 1918 - November 1919; the retreat from Omsk to Vladivostock following the success of the Bolshevik army, November 1919 - March 1920; stationing in Gibraltar and Egypt, 1921-1922; life and work in Simla, Waziristan and Kamptee, India, 1922-1928; work as an intelligence officer, Meshed, Persia (Iran), 1928-1931; life and work in Bombay, Ajmer, Jhansi, Alwar and Delhi, India, 1932-1935, including description of rioting under the Maharajah of Alwar; experiences working in India, China and Egypt during World War Two, including visit to Palestine; account of working in the post-war timber trade and as a consultant in the Russian Section of the London Chamber of Commerce. Also article 'Anglo-Russian Timber Trade: Personal Reminiscences and Reflections of Col L Steveni', The Timber Trades Journal , 11 March 1961, and article by Richard J Aldrich, University of Nottingham, from Modern Asian Studies 32, 1 (1998), pp. 179-217, entitled "Britain's Secret Intelligence Service in Asia during the Second World War" including analysis of Steveni's role as Director of British Secret Intelligence Service (SIS) in Asia.

War Cabinet Minutes (HMSO), 1939-1945 is a themed microfiche collection containing copies of the minutes of the War Cabinet Meetings, Sep 1939-Jul 1945, and Cabinet Conclusions and Confidential Annexes, 1941-1945. Meeting minutes include British plans to create discord amongst the German High Command, Nov 1939; criticism of the military campaign in Norway, May 1940; First Lord of the Admiralty Winston (Leonard Spencer) Churchill's criticism of the Allied propaganda campaign in France, May 1940; speculation on the ability of the German population to sustain prolonged war, May 1940; reaction to the Allied withdrawals in France and Belgium, May 1940; the debate over the possible compromise peace with Germany, 26-28 May 1940; the decision to intern all enemy aliens in the United Kingdom; May 1940; Churchill's reaction to American isolationism, May 1940; the seizing of French warships in British and Egyptian harbours and the sinking of French warships at Mers-el-Kebir, Egypt, 23 Jun 1940; straining Anglo-French relations, Jul 1940; the Anglo-American 'destroyers for bases' agreement, Aug 1940; Churchill's attempt to take to court the Sunday Pictorial and the Daily Mirror over the newspapers' alleged anti-Government editorials, Oct 1940; preparations for the possible German invasion of the Britain, 1940; civil defence precautions in Britain, 1940; the British intervention in Greece, 1941; speculation on Soviet military collapses following the invasion of the Soviet Union by German armed forces, Jun 1941; Churchill's appeals to US President Franklin Delano Roosevelt for American intervention in the war, 1941; reaction over the fall of Singapore and Malaya to Japanese armed forces, Feb 1942; Anglo-American preparations for the invasion of North Africa, 1942; naval and air operations against France, 1943; the 'Beveridge Report' on social security in Britain, 1943; reports on Allied conferences at Casablanca, Jan 1943, and Washington, May 1943; the Allied decision to invade France made at the QUADRANT Conference, Quebec, Canada, Aug 1943; the planning and conduct of Operation OVERLORD, the Allied invasion of France, Jun 1944; the effect of the bombardment of London by German V1 pilotless aircraft and possible RAF reprisals against German civilian targets, Jun 1944; post-war reconstruction and rehabilitation in Europe, Jul 1944; plans for the Allied occupation of Germany and Austria, Nov 1944; British intervention in Greece in order to prevent a Communist take-over of the peninsula, Nov 1944; the establishment of the United Nations, 1945; arrangements for celebrating the end of the war in Europe, May 1945; the British General Election, Jul 1945.

Photocopies of memoir covering military service, 1860-1918; published account of Tochi Valley expedition, Afghanistan, 1897-1898; complaint relating to conditions in trenches, Western Front, World War One, 1915.

Copies of editions of World War Two newspapers, including Daily Express; Daily Sketch; Daily Mail; Daily Mirror; Daily Herald; Evening Standard; and Union Jack, 1940-1945, with articles relating to the withdrawal of British and French forces at Dunkirk, France, May 1940; the German occupation of Athens, Greece, Apr 1941; German and Italian frontier assaults across the Egyptian border, Apr 1941; US naval protection of British merchant routes across the Atlantic, Apr 1941; the Japanese bombing of Pearl Harbour, Hawaii, United States, Dec 1941; the Japanese declaration of war on Britain and the United States, Dec 1941; the US naval victory over the Imperial Japanese Navy at Midway Island, Jun 1942; the establishment of Supreme Headquarters Allied Expeditionary Force in London, under the commander of US Gen Dwight David Eisenhower, Jan 1944; the Allied capture of Rome, Italy, Jun 1944; the Allied invasion of Northwest France, Jun 1944; the surrender of the German armed forces in Paris, France, Jun 1944; the unconditional surrender of all German armed forces in Italy, May 1945