http://www.google.com/imgres?start=0&num=10&hl=en&biw=1680&bih=947&tbm=isch&tbnid=dB7tLkHH1BsN7M:&imgrefurl=http://www.bbc.co.uk/scotland/learning/bitesize/standard/geography/population/distribution_density_rev1.shtml&docid=xXYikrJDWdoNfM&imgurl=http://www.bbc.co.uk/scotland/learning/bitesize/standard/geography/images/g155.gif&w=546&h=290&ei=JUvyT5LyJZOQ8wSXuK2HAg&zoom=1&iact=hc&vpx=1331&vpy=474&dur=461&hovh=163&hovw=308&tx=141&ty=71&sig=113213532916660177585&page=1&tbnh=99&tbnw=187&ndsp=41&ved=1t:429,r:24,s:0,i:24
This is an example of dot distribution map, showing frequency in an area...in this case, world population. One date equals 100,000 people.
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