Source Data Reference for:

City = Cologne
Time = 1800

City Year Size Size Comment Year Comment Author Title Location
Cologne1800 41,000Tertius ChandlerFour thousand years of urban growthp23
Cologne1800 41,000Paul BairochLa population des villes europeennes de 800 a 1850
Cologne1800 42,000Jan De VriesEuropean urbanization 1500-1800p273
Cologne1800 41,000Tertius ChandlerFour thousand years of urban growthp486