Source Data Reference for:

City = Gdansk
Time = 1850

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Elbing	1850	23,000			Tertius Chandler	Four thousand years of urban growth	p26
Gdansk	1850	64,000			Tertius Chandler	Four thousand years of urban growth	p24
Gdansk	1850	64,000			Paul Bairoch	La population des villes europeennes de 800 a 1850
Gdansk	1860	72,300			n/a	Gothaischer Hofkalender