I love data like this. Find it amazing how many modern fascists claim to be pure or of a country of purity, when the reality is the entire human population has spiralled around the globe since the first bipeds walked the Rift Valley in Africa, some 2 million years ago - from memory (not that I was there or anything, no matter how old my kids call me )
I've just opened this. This set of four detailed maps should be a good companion to my recent acquisition of Peter Cunningham's Hand-Book to London (1850). I expect to use the maps as a reader of Dickens, Anthony Trollope, Arthur Machen, and other authors. Much of Machen's London writing is post-Victorian, admittedly.