Source Data Reference for:

City = Clermont Ferrand
Time = 1850

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Clermont	1850	33,000			Tertius Chandler	Four thousand years of urban growth	p26
Clermont Ferrand	1850	33,000			Paul Bairoch	La population des villes europeennes de 800 a 1850
Clermont Ferrand	1866	37,700			n/a	Gothaischer Hofkalender