Smithsonian Beginnings

Antique postcard showing the box at Cranmere Pool, Dartmoor NP, UK

Jackbear, from NY, has just planted a new box heralding letterboxing's earliest beginnings in both the UK and that Smithsonian article that began the madness here in the US. Click the postcard above to read the clue for this box, located in the Rush Rees Library on the University of Rochester's River Campus.
Nothing like a good book!