As the author died in 1942 then the authors copyright in the original work would have expired.
As I see it the only copyright that could be claimed for the ones you have found on Amazon would be in the layout and any additional illustrations, colophons, introductions etc that were not in the original work.
So if you are able to obtain the text independent of the layout etc (e.g. the Gutenberg version) then you would have a P.D. work which you could re-format and use.
Extracting the text from a Kindle version may in itself be a breach of the terms of Amazon's licence but that is not a copyright issue.
BobC
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