http://www.arabgeographers.net/up/uploads/14299936761.pdf
The History of Europe: Every Year
https://www.google.es/search?source=hp&ei=RtojXLGkM6zosAe2taLoDA&q=Atlas-World-Population-History&btnK=Buscar+con+Google&oq=Atlas-World-Population-History&gs_l=psy-ab.3..0i8i30l4.3555.3555..4438...0.0..0.121.121.0j1......0....1j2..gws-wiz.....0.98JgXkquk_M
https://www.rug.nl/ggdc/historicaldevelopment/maddison/releases/maddison-project-database-2018
https://www.rug.nl/ggdc/historicaldevelopment/maddison/
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