And at least one of those book-related icons is supposed to be visible on the community's main page - which I don't see here. Unless I'm wrong. I don't yet know every book ever written, much though I do keep trying :(

That's a pretty long-standing rule there, mostly because I'm really a bit lazy and hate searching through lots of icons to see if one fits. And it's harder when they're good icons, because then I spend time looking at them instead, and coveting them. Like putting away books when your room is a mess....