First day of the library liminal

[wolvering]

Books! I've never seen so many, ever. [There's a happy squeal.] Oh! They have a written copy of Dragon and Phoenix. It even has Bard Otter Heronson's notes in it, and I think those are notations on how to play it too! And the epic of Bram and Rani! And the creation of the Dragonlords!

[She'd apologize for being so very excited and enthusiastic about the books in everybody's heads, but she's a bit distracted by that very thing.]

I want to read them all, but I don't think I could in a whole lifetime. I just have one question. How am I supposed to find things? I've figured out that the letters and numbers are labels of some kind, but I have no idea what they mean. Does anybody know and can you explain how it works?