Copies of papers relating to his service in France, 1917, principally comprising orders and summaries of operations for Royal Field Artillery, 12 Div, 1917, orders, maps and timetables relating to trench mortar batteries on the Somme front, Jul-Sep 1917, and General Staff publications on wiring, signalling, the employment of guns and trench mortars captured from the enemy, and 2 Army operations, 1917; copies of correspondence, 1915-1917, 1969-1970, mainly letters written by Blagrove from the Somme front to his father, Col Henry John Blagrove, 1916-1917.

Photocopy of privately published memoir, 'The Great War, 1914-1818: a former 'Gunner' of the First World War looks back', a detailed account of his military career, 1913-1919, covering mobilisation in Edinburgh, artillery, gas warfare and veterinary training, service with the Royal Field Artillery on the Western Front, 1915-1918, notably action around Vimy, May-Jun 1917, Lens, June-Oct 1917, and the Somme front, Feb-Oct 1918, and entry into Lille, Oct 1918, and demobilisation in Brussels, Feb 1919, written in [1974]. Includes reproductions of photographs and extracts from his letters home and his diary.

Papers relating to bombardment of Hartlepool by three German battle cruisers, 16 Dec 1914, dated 1914, 1920, 1922, [1930-1940], 1934, 1938, notably including Trechmann's official report to Lt Col L Robson, Officer Commanding, Durham Royal Garrison Artillery, dated 16 Dec 1914; Robson's official report to the Fortress Commander, West Hartlepool, dated 16 Dec 1914; 'The bombardment of the Hartlepools' by Capt W A Murley, an offprint from the [Royal Regiment of Artillery] journal, [1930-1940]; The Great War: I was there! part 7 (1938), including an anonymous article on 'British pluck and luck at the Hartlepools'. Typescript text on his military service, 1914-1917, notably his experiences with the Heugh Battery, Hartlepool, 1914-1915, and with 41 Siege Battery at the Battle of the Somme, 1916, and Battle of Vimy Ridge, 1917.