https://geographicdatascience.com/
http://www.alex-singleton.com/R-Tutorial-Materials/7-converting-coordinates.pdf
https://www.students.ncl.ac.uk/keith.newman/r/maps-in-r
https://cran.r-project.org/doc/contrib/intro-spatial-rl.pdf
http://stackoverflow.com/questions/24136868/plot-map-with-values-for-countries-as-color-in-r
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