Changes

*''The War in the Air: being the story of the part played in the Great War by the Royal Air Force''. Volume I by Walter Raleigh 1922. Volumes II-VI by H A Jones 1928-1937. Part of the series ''History of the Great War based on official documents''. [https://archive.org/details/warinairbeingst01rale Volume I], [https://archive.org/details/warinairbeingsto02rale Volume II] (including Gallipoli), [https://archive.org/details/warinairbeingsto03rale Volume III] (inc East Africa), [https://archive.org/details/warinairbeingsto04rale Volume IV], [https://archive.org/details/warinairbeingsto05rale Volume V] (inc Egypt/Palestine, Mesopotamia, Macedonia), [https://archive.org/details/warinairbeingsto06rale Volume VI] (inc Palestine, Mesopotamia, India) Archive.org

*''History of the Great War: [https://archive.org/details/principalevents100grea Principal Events, 1914-1918''] compiled by the Historical Section of the Committee of Imperial Defence. 1922 Archive.org

*[https://archive.org/details/experiencesofdug00calluoft ''Experiences of a Dug-Out, 1914-1918''], by Major General Sir C E Callwell 1920 Archive.org. The author was appointed to the high ranking role of Director of Military Operations (DMO) at the War Office at the outbreak of the war. [Dug-Out: a retired officer, recalled to employment].

*[https://archive.org/details/cradleofwar00wood ''The Cradle of the War: The Near East and Pan-Germanism''] by Henry Charles Woods 1918 Archive.org