I grew up in a time when the World Book Encyclopedia was the be all-and-end-all of popular reference volumes. Of course there was the more prestigious Encyclopedia Brittanica, but who could afford those. Yes, there was a world before Google, but I'm not sure how we survived it.
For a few years now, I've been IN the encyclopedia. . . The Encyclopedia of Arkansas History and Culture. . . with an article about Trammel's Trace. A good overview. Check it out.