Source Data Reference for:

City = Modica
Time = 1850

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Modica	1850	31,000			Paul Bairoch	La population des villes europeennes de 800 a 1850
Modica	1850	25,000			Tertius Chandler	Four thousand years of urban growth	p26
Modica	1861	30,500		1861/62	n/a	Gothaischer Hofkalender