owid

{
    "link": "https://www.rug.nl/ggdc/historicaldevelopment/maddison/releases/maddison-project-database-2018 and http://www.ggdc.net/maddison/oriindex.htm",
    "dataPublishedBy": "Maddison Project Database, version 2018. Bolt, Jutta, Robert Inklaar, Herman de Jong and Jan Luiten van Zanden (2018), \u201cRebasing \u2018Maddison\u2019: new income comparisons and the shape of long-run economic development\u201d, Maddison Project Working paper 10",
    "dataPublisherSource": "Historical data and reconstructions from a large number of different sources. See the accompanying paper for details."
}