Source Data Reference for:

City = Veszprem
Time = 1800

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Veszprem	1800	8,000			Paul Bairoch	La population des villes europeennes de 800 a 1850
Veszprem	1820	4,500			Valentin Parisot	Dictionnaire geographique universelle