Roughly 3500 volumes. Lots of Victorian British lit. and criticism of same. Lots of US history, particularly Appalachia (all eras) and 19th-century Western frontier. A bookcase full of psychology and related topics. More than a few thrillers. And a small but growing non-English language collection, mostly Scottish Gaelic and Swedish (some French, German, and Icelandic, but I'm slow af reading those languages).

I downsized by half when I moved and then did the same again when I moved again. Some of what I got rid of was useless to me, but I regret a lot of it. So... knowing I'll never mass-downsize again, I'm more selective in what I buy, which has slowed the growth of my library. Just the same, given the average lifespan, I'm looking at over 10,000 before I die. My library is actually part of my death planning because I don't want my kids to be stuck dealing with it, lol.