A couple vintage joke books, while hanging in the grandfather in laws man cave, there were jokes I had never seen before and I laughed for quite a while. I'm the kinda guy who has to memorize jokes so when I tell them I'm not the one laughing. Sadly Alzheimers disease taking him away.
For knowledge, a current encyclopedia, a book of world records, an anarchists cookbook, a chemistry book may be informative and a good source of entertainment. A basic electronics book now is what I imagine the analogue for some of the old general knowledge books. Almanacs, they're great to have around.
Someone mentioned the home depot DIY books, I second that.
In an electricity free world, sundials marked time and in their locality, individuals could probably tell you the time +/- 15 minutes, so I'd recommend a book on sundials.
Most places have literature on the local history or traditions from many perspectives, my home state has so many books about it that I'd be hard pressed to read them all in a year, many of them while entertaining also have nuggets of wisdom that might not be observable to an outsider.
A good book on water filtration, sewage management, car repair (prices are getting better for manuals, maybe a local mechanic or library is tired of a forgotten repair manual).
I love books, I love reading and so long as your shelf has something to make the mind wander, it will be good because a stagnant mind is all but dead.