Data-mining reveals that 80% of books published 1924-63 never had their copyrights renewed and are now in the public domain

“Worth reading” is still in the opinion of the gatekeepers. Unless the book became a runaway best-seller despite a near-complete lack of marketing support from the publisher (“Valley of the Dolls” being the textbook example) it’s pretty easy for a really good book to sink into obscurity.
You really should sift through them; there’s really no telling what wonderful, unjustly-lost treasure might fall into your awareness.

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