Source Data Reference for:

City = Allahabad
Time = 1850

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Allahabad	1850	70,000			Tertius Chandler	Four thousand years of urban growth	p80
Allahabad	1864	100,000	passed for the 1st time		Tertius Chandler	Four thousand years of urban growth	p542