Here is a link to a BBC web page, which does contain a small non-enlargable copy of the map of the entire study area (UK). So far I have not found a site that has the map at a size where you can actually read it, although the small sized map's colors do clearly show Cornwall and Devon as unique from both each other and from the rest. http://m.bbc.com/news/science-environment-31905764 The article includes this text: "There is also a marked division between the people of Cornwall and Devon that almost exactly matches the county border. And the People of Devon are distinct again to those from neighbouring Dorset."