U.S. Census Bureau, Census of Population: 1970 and 1980, Vol. I;
1990 Census of Population and Housing, Population and Housing Unit Counts
(CPH-2-1);
County and City Data Book 2000;
“SUB-EST2006: Subcounty Population Estimates, April 1, 2000 to July 1, 2006”
Release Date: June 28, 2007;
< http://www.census.gov/popest/cities/files/SUB-EST2006-IP.csv >.
For more information:
http://www.census.gov/population/www/
referenced on dataset section Notes (#2)
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