Don has sold a LOT of cartoons in his career. Each numbered cartoon or illustration on the left side of this Blog is from a DIFFERENT magazine, newspaper, etc. Let's see if we can find out the total number of publications (places) where Don's work has appeared . . . . . (An unnumbered posting is a duplicate publication.)

Saturday Evening Post (No. 7)

Makes you wonder if a prison anywhere offers pole vaulting in its exercise program. Doubtful!
This Saturday Evening Post cartoon was published November 9, 1962, page 70.
Don got the idea for this cartoon from one that appeared in the English humor magazine Punch. It showed a bulletin board with prisoners looking at a sign-up notice for pole vaulting. Don improved on the gag with his "switch," a common practice among cartoonists.