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by monoideism 2336 days ago
> So, unpublished manuscripts are not necessarily in the public domain, even if they were written 100s of years ago.

This may well be the case in the UK, but this assertion would likely not apply in the US, for multiple reasons. For one thing, manuscripts that have been displayed in a museum would be counted as published. Also, in the US copyright expires 120 years following creation, at the very latest.