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@TerryHancock I noticed that as well. AFAICT, from the Gutenberg site, they're saying that the original copyright registration was not renewed (and it had to be, for all the works copyrighted between 1929 and 1964, after which it became automatic or whatever).

Searching for whether there was a renewal is generally a bear; only some of the records are OCRed & searchable. For the others, you have to step through images of handwritten renewal form scans. I did a ton of those for my PhD clearances.