Source Data Reference for:

City = Washington
Time = 1950

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Washington	1925	462,000			Tertius Chandler	Four thousand years of urban growth	p506
Washington	1950	1,285,000			Tertius Chandler	Four thousand years of urban growth	p507
Washington	1950	802,200			Johan Huizinga	Internationaal aardrijkskundig woordenboek
Washington	1970	2,957,000			Tertius Chandler	Four thousand years of urban growth	p510