Copy of his account of Battle of Jutland, 31 May 1916, written on 4 Jun 1916. Copy of text of his despatch from HMS SCYLLA on the Normandy landings, 6-7 Jun 1944, broadcast on the [Forces Programme], 7 Jun 1944, with covering letter, 24 Jun 1944. Copies of extracts from his diary covering his discussion with Adm Hon Sir Alexander Robert Maule Ramsay about the planningof the Normandy landings, Dec [1944], and his visit to Germany, Jun 1945, including his observations on German scientific and technical developments and his interviews with British and German naval officers. Two letters to Grenfell's wife from Baron von Müllenheim-Rechberg, a survivor of the sinking of the Bismarck, May 1941, dated 1978, concerning Grenfell's book The Bismarck episode (Faber and Faber, London, 1948).

Papers relating to his military career, 1922-1946, dated 1930, 1936 and [1946] principally comprising typescript log of railway survey work carried out by Herbert, Lt Charles Granville Barry Greaves and Capt Donald Maitland James Murray, Tanganyika, 1930, written by [Murray] in [1930]; The Royal Engineers Journal vol 50 Sep 1936, including 'Railway Survey in Tanganyika Territory' by Herbert; official 501 Inter-Service Mission 'Transportation report on the proposal for a base in East Africa', written by Herbert in 1946; copies of letters of appreciation concerning rehabilitation of Burma railway system carried out by Transportation Service, 1945; copy of Herbert's curriculum vitae, 1922-1946, written in 1946.

Papers relating to service in HMS GLOUCESTER, Royal Naval Volunteer Reserve, World War Two, including photocopy of diary, 1939-1940, naval messages, 1940-1943, and photographs; official service records, 1941-1958; and papers relating to naval career, 1949-1964, including article dated 1965, 'A Perspective View of Naval Engineering', on the Electrical Branch of the Royal Navy.

Unpublished typescript memoir 'Naval Career of Vice-Admiral Sir Allan Trewby', including descriptions of training as a cadet and at the Royal Naval Engineering College, Keyham, 1931-1939; service during World War Two, including mine sweeping in Scotland, training at the Royal Naval College in Greenwich, transporting Prime Minister Winston Churchill to Norfolk, Virginia, USA, for meetings, and service on a cruiser patrolling the Mediterranean; work in the Gas Turbine section, Admiralty, and as Assistant Director of Marine Engineering, Amiralty 1951-1962; service as Captain of HMS SULTAN, 1963-1964; work as Assistant Controller, Polaris, 1968-1971, and work as Chief of Fleet Support, 1971-1974. Papers relating to his work with naval gas turbines, dated 1954-1955, 1962-1963, notably including Transactions of the American Society of Mechanical Engineers , vol 77 no 4, May 1955, Transactions of the American Society of Mechanical Engineers Series A: Journal of Engineering for Power , vol 85 no1, Jan 1963, and Transactions of the Institute of Marine Engineers , vol 66 no 6, Jun 1954, all including articles by Trewby on British naval gas turbines; 'Marine gas turbines in the Royal Navy', printed text of lecture given by Trewby at the Institute of Marine Engineers International Conference, May 1962.

German armed forces maps, gazetteers, and geographic charts of the United Kingdom, 1939-1944. Includes detailed study produced by the Commander in Chief of the German Air Force concerning the organisation of the RAF, the strengths and locations of British aircraft production facilities, the location of RAF flight schools, airfields and anti-aircraft facilities, the location and strengths of RN facilities in Britain and the North Sea, and British aircraft carrier strengths, 1939; German harbour atlas and gazetteer produced and distributed by the Commander in Chief of the German Air Force, entitled Seehafensatlas Großbritannien, detailing in 1:50,000 maps and aerial photographs, naval harbours and ports in Britain, 1940; German Navy High Command map books of naval ports and harbours in the United Kingdom, their associated agricultural and heavy industries production rates, defence facilities, and geographical locations, 1940; map books issued by the Commander in Chief of the German Air Force, entitled Luftgeographisches Einzelheft Großbritannien, detailing the location of British heavy industry, gas works, water works, aircraft and naval production facilities in Britain, including 1:21,120 maps, 1940; German Army High Command book, entitled Militärgeographie Angaben über Irland, and detailing in photographs the towns, cities and countryside of Ireland and Northern Ireland; German Army Command gazetteer of Ireland and Northern Ireland, entitled Militärgeographie Angaben über Irland, listing county sizes, numbers of inhabitants, population densities, industries, and harbour and port facilities in Ireland and Northern Ireland, 1940; German Army High Command gazetteers of Britain, listing alphabetically towns and cities, their longitude and latitude co-ordinates, their respective counties, numbers of inhabitants, industrial and agricultural production rates, and trains station facilities, 1941; map book distributed by the Commander in Chief of the German Air Force, entitled Britische Flugrüstungsindustrie, detailing the location, size, and production rate of ship-building and aircraft production centres in Great Britain, 1941; map books distributed by the Commander in Chief of the German Air Force including detailed photographs, 1:100,000 and 1:250,000 maps, longitude and latitude co-ordinates, population density statistics, and points of reference notes for town and cities in Britain, 1943-1944