Ian Castle. The First Blitz: Bombing London in the First World War. Oxford and New York: Osprey, 2015. As seen on the Internet! I already own the two books which this combines. But they were review copies so I didn't pay for them; it seems fair enough to support the author more concretely this time.
Robert Loeffel. The Fifth Column in World War II: Suspected Subversives in the Pacific War and Australia. Basingstoke and New York: Palgrave Macmillan, 2015. Depressingly timely in the current situation. While on the question of titles, I think most people would assume that a book called The Fifth Column in World War II was about Europe, or perhaps the United States -- definitely not Australia. But this does at least look briefly at the origins of the fifth column fear in Europe, as well as how it was imported into the Australian context. (Spoiler: there was no fifth column, as such.) I'd love to see something this thorough for the British case, for that matter. As a bonus, my article about the 1918 Australian mystery aeroplane episode is cited, a clear sign of quality :)
Neil R. Storey. Zeppelin Blitz: The German Air Raids on Great Britain during the First World War. Stroud: History Press, 2015. As with The First Blitz, I've discussed this book here recently, sight unseen, so I should probably actually buy it instead of just talking about it. It's a very solid and well-illustrated text, and looks like a fairly comprehensive guide to the Zeppelin raids on Britain (and it even discusses the prewar phantom airships, though without giving sources). However, by only including airship raids it provides a distorted picture of the campaign (and the Gotha raids of 1917 and 1918 were the most 'Blitzy' of the war, if you're going to go down that path); and its claim to originality is undermined by the failure to cite Christopher Cole and E. F. Cheesman's The Air Defence of Britain 1914-1918 (1984), which is still the definitive account of the operational aspects of the raids and is pretty clearly also based on the GHQ summaries (among other sources), even if their own refusal to actually cite anything is irritating.
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