Source Data Reference for:

City = Cologne
Time = 1400

City Year Size Size Comment Year Comment Author Title Location
Cologne1400 40,000Tertius ChandlerFour thousand years of urban growth"p8, p18"
Cologne1400 40,000Tertius ChandlerFour thousand years of urban growthp513
Cologne1400 40,000Paul BairochLa population des villes europeennes de 800 a 1850