This is one where you'd probably need to get proper legal advice if you intend to make any money from these photos. A letter to a responsible photo magazine may get a reply as it would be an interesting subject for them to print the information in the magazine as this topic must come up quite regularly.
Generally, I think copyright doesn't lapse until 75 years after the death of the artist but whether you bought the copyright when you purchased the negatives from the lady's executors without specifically stating it at the time is an interesting legal point.
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