image is a derivative work of the following images: File:USA_counties_FIPS_text_addressable.svg licensed with Cc-by-sa-3.0, GFDL, PD-self 2009-05-20T01:50:12Z
work of the following images: File:Swine_flu_infection_exponent_by_county_June_2009.svg licensed with Cc-by-sa-3.0, GFDL, PD-self 2009-06-23T06:02:59Z Mike