Source Data Reference for:

City = Gdansk
Time = 1800

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Gdansk	1800	41,000			Tertius Chandler	Four thousand years of urban growth	p486
Gdansk	1800	41,000			Tertius Chandler	Four thousand years of urban growth	p23
Gdansk	1800	40,000			Jan De Vries	European urbanization 1500-1800	p272
Gdansk	1800	37,000			Paul Bairoch	La population des villes europeennes de 800 a 1850