https://www.autodeskresearch.com/publications/samestats
https://xkcd.com/977/
http://epsg.io
https://www.google.de/search?client=opera&q=download+shapefile&sourceid=opera&ie=UTF-8&oe=UTF-8&gfe_rd=cr&ei=-Y1LWciCFYLBaJ77qeAO
https://www.statsilk.com/maps/download-free-shapefile-maps
http://wiki.openstreetmap.org/wiki/Shapefiles
http://www.gadm.org
https://ikashnitsky.github.io
https://github.com/Robinlovelace/Creating-maps-in-R
https://bookdown.org
https://www.r-bloggers.com
https://xinye1.github.io/projects/brexit-cartogram-leaflet/
http://rpubs.com/bhaskarvk/tilegramsR
https://github.com/sjewo/cartogram
https://cran.r-project.org/web/packages/tmap/vignettes/tmap-nutshell.html
https://r-spatial.github.io/sf/index.html
swirl
http://swirlstats.com
http://rmarkdown.rstudio.com/formats.html
https://ramnathv.github.io/slidifyExamples
http://lab.hakim.se/reveal-js/
http://rmarkdown.rstudio.com/revealjs_presentation_format.html