The researcher's explanation of his research: http://rocs.northwestern.edu/research/wgstory.html http://rocs.northwestern.edu/research/wgstory.html Edit: this

The researcher's explanation of his research: http://rocs.northwestern.edu/research/wgstory.html http://rocs.northwestern.edu/research/wgstory.html Edit: this link doesn't explain this specific set of maps, but it does explain a little about how he got the idea of using wheresgeorge.com and what it allowed him to do (as of ~2009).