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In many countries you don't need to register a copyright, but it is automatically granted to you. Therefore it is probably unnecessary for you to do anything. Typically you can declare it on the title page of the book.


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as @rgchris pointed out, copyright laws in Europe state that an opus goes in the public domain 70 years after the death of its author... and Campbell died in 1987. I think you should contact the Campbell Foundation.


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