This. 20 years on the internet and right now is when I first learn of Bookfinder, which looks like a wonderful resource. Just like HN, where I was just reading and learning from the comments on this remarkable self-operation when, like you, I serendipitously stumbled on Bookfinder. HN is one of the few places online where I can count on finding an unexpected wormhole into a different knowledge universe. My favorite website of them all.