Source Data Reference for:

City = Plovdiv
Time = 1600

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Plovdiv	1600	28,000			Paul Bairoch	La population des villes europeennes de 800 a 1850
Plovdiv	1600	28,000			Tertius Chandler	Four thousand years of urban growth	p20