The population in large urban concentrations in the United States, 1790-1980: a delineation using highly urbanized counties.
Gibson
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Population Division, U.S. Bureau of the Census, Suitland, Maryland 20233.
D003625:Data Collection; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D011158:Population Growth; D014481:United States; D014505:Urban Population