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Another complex issue is that prior to some point in the mid 1960s, copyright had to be manually "renewed" in the US. That's why all the magazine SF is being posted to PG - they are magazine stories for which the copyright was not renewed, and hence the material "inadvertently" entered the public domain. Book publishers appear to have been pretty rigorous about renewing their copyrights, but magazine publishers less so. I guess that it was material which wasn't thought to have any lasting value at the time.
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