Source Data Reference for:

City = Philadelphia
Time = 1950

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Philadelphia	1925	2,085,000			Tertius Chandler	Four thousand years of urban growth	p522
Philadelphia	1925	2,085,000			Tertius Chandler	Four thousand years of urban growth	p505
Philadelphia	1925	2,085,000			Tertius Chandler	Four thousand years of urban growth	p532
Philadelphia	1925	2,085,000			Tertius Chandler	Four thousand years of urban growth	p534
Philadelphia	1950	2,900,000			Tertius Chandler	Four thousand years of urban growth	p534
Philadelphia	1950	2,071,600			Johan Huizinga	Internationaal aardrijkskundig woordenboek
Philadelphia	1950	2,900,000			Tertius Chandler	Four thousand years of urban growth	p530
Philadelphia	1950	2,894,000			Tertius Chandler	Four thousand years of urban growth	p540
Philadelphia	1950	2,900,000			Tertius Chandler	Four thousand years of urban growth	p507
Philadelphia	1970	5,279,000			Tertius Chandler	Four thousand years of urban growth	p510