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The regimental War Diaries are held at The UK National Archives and as of April 2020 have been made available for free download*. They are the official unit war diaries for the British Army that contain records of daily activities, including casualties. They are not personal diaries.
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Lieutenant Clarence Edwards Nooth Cooper
Royal Flying Corps
Date of death: 16/09/1916 (aged 25)
Cemetery: GROVE TOWN CEMETERY, MEAULTE
Son of George C. N. and Josephine Cooper, of 107, South Norwood Hill, London. Native of Putney, London.
Lieutenant John Stephen Cooper
Royal Flying Corps, 70th Sqdn.
Date of death: 25/03/1917 (aged 25)
Cemetery: H.A.C. CEMETERY, ECOUST-ST. MEIN
Son of John William and Alice Cooper.