Quote:
Originally Posted by GtrsRGr8
If I'm not mistaken (and that's a big "if"), having a copyright notice in a book in the U.S. is not necessary for a copyright to exist/be valid/be in effect for that book.
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It isn't necessary any more. But before 1st January 1978, anything published in the US "under the copyright owner’s authority" without a copyright notice automatically fell into the public domain.
As for "Leather for Libraries", the first one of the authors I checked, Edward Wyndham Hulme, died in 1951, and so the book is in copyright until at least 2022 in the UK. I suspect it is public domain in the US.
I notice that the chapters seem to be attributed to single authors, and so each individual chapter might be considered to have a different length of copyright.