A while ago, LoFi hired someone to redesign the icons for items. But as I was updating pages, I noticed that the icons for books which are related to the UC weren't changed. Mostly, they all use this icon File:Book1.png or the letter icon. Book1 icon looks like a spiral-bound notebook. Meanwhile, books distributed in the HN look like hardcover bound books. (example: Scripture of Radiance Series)
I feel like this small detail goes against lore somewhat as the HN is the faction opposed to technology. But it could still make sense as in Europe's dark ages, monastaries produced intricate books with roughly the same tech level as HN has. Possibly the books in the UC are garb looking because they're mass produced by slaves, but in the HN there are dedicated book-makers.