Springsteen in the USA: 40 Years of Touring as a Study in Spatial Diffusion (youtube video)
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Animated heat map of Bruce Springsteen touring locations from 1973-2012. The heat effect is generated by a) the location of the show, b) the size of the venue, and c) the overall population within 40km of the show location
Click on Springsteen in the USA: 40 Years of Touring as a Study in Spatial Diffusion (youtube video) to open the resource.