Source Data Reference for:

City = Gao
Time = 800

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Gao	800	72,000			Tertius Chandler	Four thousand years of urban growth	p282
Gao	800	72,000			Tertius Chandler	Four thousand years of urban growth	p528
Gao	800	72,000			Tertius Chandler	Four thousand years of urban growth	p467
Gao	800	72,000			Tertius Chandler	Four thousand years of urban growth	p55