I regularly take my copy of one of the volumes of Knuth's TAOCP off the shelf.

The stuff in those books will never get old, and I often find myself searching for some algorithm or concept that I know I've skimmed over in the past, but no web-searches or LLMs can give me an answer on.

I think it may be due to the lack of open, digital copies of TAOCP available for pillage, as well as the fact that the books don't target a particular language.