Posthumously published works are tricky. It depends on the country.
In the USA, they have life+70 if published after 2002. So the same as works published during the author's lifetime.
In the UK, the copyright for previously unpublished works by Forrest Reid last until 1st January 2040, as he died before 1st January 1969.
Other countries will have different rules.
For uploading to MobileRead, you'd need to make sure that your copy didn't include any material that was only published after his death.
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