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I think you're OK. There is copyright in the typesetting and layout of books in some regions laws, but it doesn't last anywhere as long-- 25 years, in the UK (and probably the rest of the EU) if I recall correctly. So any copyright in the typesetting of a 60 year old book will have expired decades ago.
The author is past caring, and if the scanned edition was printed that long ago, the publishers know they'd get nowhere trying to pursue a legal case. Don't worry.
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