Ugh, I remember finding one so hugely massive on my miqote that I hated it D:!! It was 3-4x the size of my other books. Too bad I can't remember which it was, and I can't log in due to psn issues.. but I want to say it was in the 40s range. Have you tried scrolling through the alchemist crafting log and trying on each book? I think it may have even been a GC weapon in the 40s, though.. so maybe check out those.