The choice of aircraft in the Observers book of Aircraft was simple.
It had to be under development or in production.
This meant inclusion of many obscure types that didn’t make it while out of production types like the Douglas DC3,4,6,7, Lockheed Constellations and many others were out by the sixties despite still flying around in their hundreds.
I can’t think of anything that would have appeared in the book then…..apart from the usual common types
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