Source Data Reference for:

City = Perpignan
Time = 1850

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Perpignan	1850	18,000			Paul Bairoch	La population des villes europeennes de 800 a 1850
Perpignan	1850	21,000			Tertius Chandler	Four thousand years of urban growth	p26
Perpignan	1866	25,300			n/a	Gothaischer Hofkalender