Source Data Reference for:

City = Plovdiv
Time = 1000

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