The hotspots map is a working model, with the map changing as we work. Here are some of the older versions of the hotspots.
Map in National Geographic Magazine, October 2007
Full set of 18 hotspots, August 2007
Map of 13 hotspots, for publication in the October 2007 issue of National Geographic Magazine
Top 13 hotspots, June 8, 2007
Working version, March 2007
More maximal set, October 2006
August 2006 version
