Source Data Reference for:

City = Preslav
Time = 1000

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Preslav	900	40,000			Tertius Chandler	Four thousand years of urban growth	p538
Preslav	900	40,000			Tertius Chandler	Four thousand years of urban growth	p468
Preslav	900	60,000			Paul Bairoch	La population des villes europeennes de 800 a 1850
Preslav	1000	20,000			Tertius Chandler	Four thousand years of urban growth	p15
Preslav	1000	30,000			Paul Bairoch	La population des villes europeennes de 800 a 1850
Preslav	1000	30,000			Tertius Chandler	Four thousand years of urban growth	p538