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Yes it does remain with him until 75 yrs after he died. However, if he owned the copyright and it wasn't passed on as part of his estate, then who is likely to argue? Or collect royalties, for that matter.
If he was an employee of the magazine, odds are the copyright remains with them anyway, and as they have given permission for the image to be used...
I would suggest that he does deserve a mention by name though.
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