GADM Data. Database of Global Administrative Areas 3.6 edition.
GADM Data [link]Paper  abstract   bibtex   
[Excerpt] [::About] GADM wants to map the administrative areas of all countries, at all levels of sub-division. We use a high spatial resolution, and of a extensive set of attributes. This is a never ending project, but we are happy to share what we have. [...] [::Data] The current version is 3.6 (released on 6 May 2018). It delimits 386,735 administrative areas. You can download the spatial data by country. Downloading by country is the recommended approach. You can also download the data for the entire world. [...]
@book{databaseofglobaladministrativeareasGADMData2018,
  title = {{{GADM}} Data},
  author = {{Database of Global Administrative Areas}},
  date = {2018},
  edition = {3.6},
  url = {https://web.archive.org/web/201906/https://gadm.org/data.html},
  urldate = {2019-06-17},
  abstract = {[Excerpt] 
[::About] GADM wants to map the administrative areas of all countries, at all levels of sub-division. We use a high spatial resolution, and of a extensive set of attributes. This is a never ending project, but we are happy to share what we have. [...] 
[::Data] The current version is 3.6 (released on 6 May 2018). It delimits 386,735 administrative areas. You can download the spatial data by country. 
Downloading by country is the recommended approach. You can also download the data for the entire world. [...]},
  keywords = {~INRMM-MiD:z-DD2QBGKX,administrative-units,gadm,global-scale,open-data}
}
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