Source Data Reference for:

City = Tula (MEX)
Time = 1000

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Tollan	900	75,000			Tertius Chandler	Four thousand years of urban growth	p537
Tollan	900	50,000			Tertius Chandler	Four thousand years of urban growth	p468
Tollan	1000	100,000			George Modelski	World Cities -3000 to 2000	p57
Tollan	1000	50,000	"over 50,000"		Tertius Chandler	Four thousand years of urban growth	p528
Tollan	1000	50,000	"listed with Tajin at 50,000"		Tertius Chandler	Four thousand years of urban growth	p39
Tollan	1000	51,000	"btw 50,000 & 52,000"		Tertius Chandler	Four thousand years of urban growth	p469