The Smithsonian Institution's Flickr photostream includes a set dedicated to the 1925 "Scopes Monkey Trial." A keen-eyed user - probably someone from the Smithsonian - added a note to the photo, pointing out a dinosaur "easter egg."
Zoom in, and it comes in loud and clear. I haven't been able to figure out what paper the boy is selling, unfortunately.
The Smithsonian's Bigger Picture blog features a post about this collection of images.