Source Data Reference for:

City = Ibadan
Time = 1850

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Ibadan	1829	1,000	came into existence		n/a	http://www.wikipedia.org/	eng2020
Ibadan	1829	1,000	began to grow		Rough Guide	West Africa	p1053
Ibadan	1850	55,000			Tertius Chandler	Four thousand years of urban growth	p59
Ibadan	1850	55,000			Tertius Chandler	Four thousand years of urban growth	p294
Ibadan	1853	60,000			Tertius Chandler	Four thousand years of urban growth	p294
Ibadan	1856	70,000			Tertius Chandler	Four thousand years of urban growth	p294