Source Data Reference for:

City = Haarlem
Time = 1800

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Haarlem	1800	22,000			Paul Bairoch	La population des villes europeennes de 800 a 1850
Haarlem	1800	21,000			Tertius Chandler	Four thousand years of urban growth	p488
Haarlem	1800	21,000			Jan De Vries	European urbanization 1500-1800	p271
Haarlem	1800	21,000			Tertius Chandler	Four thousand years of urban growth	p25