Source Data Reference for:

City = Cremona
Time = 1200

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Cremona	1160	20,000			Tertius Chandler	Four thousand years of urban growth	p8
Cremona	1200	25,000			Paul Bairoch	La population des villes europeennes de 800 a 1850
Cremona	1200	25,000			Tertius Chandler	Four thousand years of urban growth	p16