"Prior to 1964, books had a 28-year copyright term. Extending it required authors or publishers to send in a separate form, and lots of people didn’t end up doing that. Thanks to the efforts of the New York Public Library, many of those public domain books are now free online....Around 80 percent of all the books published from 1923 to 1964 are in the public domain, and lots of people had no idea until now." "
If you want to read the convolution here is a link: https://www.nypl.org/blog/2019/05/31...tory-1923-1964
The link below shows the Hathi Trust Digital Library page where I simply searched "artifacts florida". I played around with search terms and also for specific volumes and there is a LOT here.
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