Intellectual Foundation of Information Organization
Incredibly dense book about library organization and cataloging systems. It’s good, but would take about three readings (with a group) to really plumb the depths of it. The key takeaway for me was: organizing information is often not perfect, and you have to make concessions to reality. Additionally, there has been a LOT of history on this subject. We’ve been cataloging books since Alexandria, probably, and a lot of people have put a lot of thought into the problem.