I have dozens, hand selected to frame in shop entryway, exhibited as the art they are. Directed at those who watch 'How It's Made', or think what we have now passes for an economy...
Haven't really crossed any significant examples online. Any body of people seeking them, at one time anyway, unclear. The largest quantity appeared in WWII era 'Life' and 'Fortune' magazine, across USA. I'm positive similar magazines followed suit across the Allies. Seemingly, 99% are drawn renderings, no photographs.
Here, we find them in sleeves, removed from the magazines, filed in antique shops. I'd swear to have examined hundreds, finding those with statements I relate to. Most get point across without a statement, pure graphics. There is advertising statements below, but the pictures carry themselves.

One for Karo Syrup; sitting on floor, a darling red-headed girl is reading history. With a finger on the page, her head turns to ask 'Mommy, Who Was Hitler?"
Another, Shell Oil, depicts a farmer mounted on a tractor, gigantically superimposed over grounds strewn with shattered buildings, planes and war materiel. The destroyed equipment, while tiny are Axis marked...

You'll notice in post #6 differences than what Jon put up originally.