Source Data Reference for:

City = Cologne
Time = 1000

City Year Size Size Comment Year Comment Author Title Location
Cologne900 21,000Paul BairochLa population des villes europeennes de 800 a 1850
Cologne1000 21,000Paul BairochLa population des villes europeennes de 800 a 1850
Cologne1000 21,000Tertius ChandlerFour thousand years of urban growthp15