@velocykel Ooh, that sounds really cool. I love getting books from library sales, but nothing beats free :) I've been working in my school's library for about a year now, and I have to come to, if not love, at least appreciate the LoC system.
At the moment I'm reading a lot of classics as part of school, so my shelves are filled with books in a very disorganized fashion. Just to try to get an idea of what I have, I've been building my own system with Logseq's query functions (which is working really well so far, but I prob wouldn't use it for more than a few hundred books. If it gets worse I'll prob switch over to Airtable or similar). Actually organizing the books on the shelf will have to come soon, though.