I remember when I was a little kid, my dad discovered a used book dealer that was on nobody's radar. We called him the old man, and he had essentially converted his house into a bookstore/library. There were probably 50 bookcases covered with treasures, and like any other bookstore, they were categorized. He really didn't have much of anything for little kids, which was when we started to go, but I remember finding a Peter Arno collection called "Excuse Me, But You're Sitting on My False Eyelashes." New Yorker cartoons for an 8-year-old.
I, of course, immediately recognized Arno's work when I saw the original Pajama Game art a few years later.