Source Data Reference for:

City = Silistra
Time = 1800

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Silistra	1800	20,000			Paul Bairoch	La population des villes europeennes de 800 a 1850
Silistria	1800	20,000			Tertius Chandler	Four thousand years of urban growth	p488
Silistria	1800	20,000			Tertius Chandler	Four thousand years of urban growth	p25