Source Data Reference for:

City = Sokoto
Time = 1800

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Alkalawa	1800	50,000			Tertius Chandler	Four thousand years of urban growth	p529
Alkalawa	1800	50,000			Tertius Chandler	Four thousand years of urban growth	p486
Alkalawa	1800	50,000			Tertius Chandler	Four thousand years of urban growth	p59
Alkalawa	1800	50,000			Tertius Chandler	Four thousand years of urban growth	p282
Sokoto	1824	40,000			Tertius Chandler	Four thousand years of urban growth	p289