Source Data Reference for:

City = Worms
Time = 1200

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Worms	1200	25,000			Tertius Chandler	Four thousand years of urban growth	p538
Worms	1200	28,000			Paul Bairoch	La population des villes europeennes de 800 a 1850
Worms	1200	25,000			Tertius Chandler	Four thousand years of urban growth	p16