This is a hard book to rate because its target audience will probably love it (and everyone else will just roll their eyes). The main thing is images of all the postcards owned by the author. But the text is desperately repetitive. For each plane: Crew, armaments, company, number produced, years of production. The cards of pilots are slightly more revealing but still focus on what is standardised rather than what is interesting: Place of birth, training, promotions, medals. The covert rise of what became the Lutftwaffe is a potentially fascinating story but here it is reduced and atomised to engine capacities and promotions. Real train spotter stuff.