Raymond H. Fredette. The Sky on Fire: The First Battle of Britain 1917-1918 and the Birth of the Royal Air Force. Washington, D.C.: Smithsonian Institute Press, 1991 [1966]. Even though it's now over 40 years old, this is still the best book around on the Gotha raids on Britain in 1917-8.

F. S. Northedge. The League of Nations: Its Life and Times, 1920-1946. Leicester: Leicester University Press, 1986. Similarly, library shelves aren't exactly overflowing with histories of the League of Nations, so I nabbed this when I saw it!

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