I pulled this off the shelf because I was looking for a citation for the joke that ends "The chef says he refuses to butcher an entire elephant just for one cutlet."
I've puzzled through the index (which confusingly refers to joke numbers rather than page numbers), and I think that joke is not in this book. But since I've hauled the thing down, I might as well read it again. I think it may be where I first encountered many other classic jokes, if not the one I was looking for.
Yes, there are several of the classics, and some I've encountered elsewhere. A useful compendium, worthy of a better index.
But not anything like unabridged. And it's somewhat dated, of course. Isaac Asimov was born in 1920, and would have mostly been telling jokes up until the early 1970s, probably. He seldom revisited things he'd written, since he was often off on another four or five books by then.
An updated version would be worthwhile, and one that's not quite so cuturally outdated.