Source Data Reference for:

City = Oyo
Time = 1800

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Oyo	1800	80,000			Tertius Chandler	Four thousand years of urban growth	p529
Oyo	1800	80,000			Tertius Chandler	Four thousand years of urban growth	p59
Oyo	1800	80,000			Tertius Chandler	Four thousand years of urban growth	p485
Oyo	1800	80,000			Tertius Chandler	Four thousand years of urban growth	p297