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And advocate for a reference on the mid-war Cruiser tanks.
The other two can be researched now pretty well, but there is a significant gap when it comes to the Cruiser tanks. The Matilda and Crusader are more "popular" subjects, so books about them might also be more popular and sell better.
All three could definitely use good, single-source references, but still, the Cruiser tanks, as an historical subject, would benefit more from your efforts.