If you can get to the right person a letter might do but if they ignore the letter, it may be harder for you because of country boundaries and costs involved. There may be no choice but to forget about it.
Copyright is a form of protection provided to the authors of “original works” and includes such things as literary, dramatic, musical, artistic, and certain other intellectual creations, both published and unpublished.
In the US and in most European Countries Copyright, in general, lasts until 70 years after the death of the creator.
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