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Very few. The reason it's in the public domain in the US is because of the US-specific system of "renewable" copyrights which was in force until the 1960s. If a copyright was not renewed (as many magazine story copyrights were not), the article entered the public domain, regardless of whether or not the author was still alive. This book is in the public domain in the US for that reason. Mr. Harrison is still alive, so the work is not in the public domain in most countries, and nor will it be so for many, many years (at least 50).
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