U.S. Census Bureau,
2000 Census of Population and Housing, Population and Housing Counts,
Series PHC-3-1, United States Summary;
Notes and Errata, 2000 SF/01-ER ;
< http://www.census.gov/prod/cen2000/notes/errata.pdf >;
Areas of the United States: 1940;
Area data for 1990: unpublished data from TIGER ®; and
Davis, Warren; personal correspondence; U.S. Census Bureau; 23 June 2006.
For more information:
http://www.census.gov/population/www/
referenced on dataset section Notes (#2)
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