While a few are brilliant, most single-panel cartoons don’t strike me as being funny or clever, and judging from the cartoon collection books I’ve found on the Internet Archive, they were even less so in olden days. Still, I could be wrong. And also I did have fun browsing through the books below.
By Dave Coverly. Pretty cute.
Funny to see the idea of funny (or clever) changing over the decades.
If you’re willing to learn a little Italian, here you go, pretty cute.
Comparatively great. (I can enthusiastically recommend the 2666-page The New Yorker Encyclopedia of Cartoons: A Semi-Serious A-to-Z Archive*, which is charmingly arranged by subject (Bluebird of Happiness, Complaint Windows).)