I love this style of illustration. Although it was already out of style by the time I was born, I feel like it was extant in conservative design strategies such as this:
Here are three scans of work by Edwin Georgi, the great American illustrator. The quality both of the sources and of the scans are middling, but I haven't seen these before. This guy is pretty much ruling me right now. Ican'tgetgetenough.