The 'In the Next War' series of books was published in London by Geoffrey Bles in 1938 and 1939. See here for a discussion.
1938:
- Air Power in the Next War by J. M. Spaight
- Propaganda in the Next War by Sidney Rogerson
- Sea Power in the Next War by Russell Grenfell
- Tanks in the Next War By Eric William Sheppard
1939:
- Gas in the Next War by Henry F. Thuillier
- The Territorial in the Next War by W.E. Green
The following titles were advertised, but apparently never published.
- Infantry in the Next War by E. E. Dorman Smith
- The Civilian in the Next War by Jonathan Griffin
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