I am to blame for Books and Mr & Mrs --both subjects I am over-enthusiastic for. Books is just dumb (me being cute --although I'm sure there are more books to be added).
I'm pretty sure that I created the 'Books' category back when I added one of the first entries - 'The Encylopedia of Supermanic Biography,' that book that Kristin Wells consulted in
Miracle Monday. I had some other books I was planning/hoping to add, but apparently I never got around to it.
There was that book about villains that Colonel Future consulted, and I'm sure there were plenty more. Superman's diary (with entries in both English and Kryptonian) also comes to mind.