http://www.census.gov/geo/www/maps/2010_census_nighttime_map/nighttime_map_2010.html
"The 2010 Population Distribution in the United States and Puerto Rico map (also referred to as the "Nighttime Map"), portrays the distribution of population in the United States and Puerto Rico based on the results of the 2010 Census of Population and Housing." Each dot represents either a person or a certain amount of people. In any other case it represents the variable measured.
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