C. D. Coulthard-Clark. The Third Brother: The Royal Australian Air Force 1921-39. North Sydney: Allen and Unwin, 1991. The classic history of the early RAAF (not that there is much serious competition). People, policies, institutions, infrastructure -- it's all here, even air displays!
Richard P. Hallion. Strike from the Sky: The History of Battlefield Air Attack, 1911-1945. Shrewsbury: Airlife, 1989. In a different way to Coulthard-Clark, another classic -- less detailed but equally comprehensive, including coverage of the role of combat air support in the various small and smallish conflicts in the interwar period.
Thomas Hippler. Governing from the Skies: A Global History of Aerial Bombing. London and Brooklyn: Verso, 2017. Follows up Hippler's previous work on Douhet by tracing a thread from air control to area or terror bombing to nuclear war the potentially unlimited (geoographical, but also and more importantly legal) reach of drone strikes. Looks like an interesting update of Sven Lindqvist's A History of Bombing.
Stefanie Linden. They Called it Shell Shock: Combat Stress in the First World War. Solihull: Helion, 2016. Based on PhD research into hundreds of case files on British and German shell-shocked soldiers, which should be a fascinating comparison. Also examines the effect of the study and attempted treatment of these men on the practice of medical research itself. One chapter touches on the Angel of Mons, though alas there seem to be no phantom airships.
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