British Battle Tanks - World War I to 1939, David Fletcher.
An excellent history of British tanks from the earliest developments, through the battles of the First World War and on into the post-war period. Strongest on the First World War tanks, which fill the first three quarters of the book, helping to explain the problems faced by the developers, how they coped with the problems of the battlefield and how the design was improved in the light of experience, making it clear that the tanks of 1918 were actually very different from the tanks of 1916, despite looking very similar [
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