Source Data Reference for:

City = Braunschweig
Time = 1200

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Braunschweig	1200	21,000			Paul Bairoch	La population des villes europeennes de 800 a 1850
Braunschweig	1200	21,000			Tertius Chandler	Four thousand years of urban growth	p16