Source Data Reference for:

City = Plymouth
Time = 1800

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Plymouth	1800	42,000			Tertius Chandler	Four thousand years of urban growth	p23
Plymouth	1800	42,000			Tertius Chandler	Four thousand years of urban growth	p486
Plymouth	1800	43,000			Jan De Vries	European urbanization 1500-1800	p270
Plymouth	1800	16,000			Paul Bairoch	La population des villes europeennes de 800 a 1850