Source Data Reference for:

City = Bydgoszcz
Time = 1850

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Bydgoszcz	1850	13,000			Paul Bairoch	La population des villes europeennes de 800 a 1850
Bydgoszcz	1860	20,500			n/a	Gothaischer Hofkalender