U.S. Census Bureau,
Income, Poverty, and Health Insurance Coverage 2004 (formerly Poverty in the United States xxxx), Current Population Reports, series
P60-214. See also
< http://www.census.gov/prod/2001pubs/p60-214.pdf >
and
http://pubdb3.census.gov/macro/032001/pov/toc.htm
referenced on dataset section 2000 (#6)
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