Note how the size and color of the circles corresponds with the navigability and size of each river. This is a great example of a proportional circle map made from the Lewis and Clark expedition notes(http://images.google.com/imgres?imgurl=http://pubs.usgs.gov/fs/fs-004-03/images/fig5lg.gif&imgrefurl=http://pubs.usgs.gov/fs/fs-004-03/&usg=__t_fsEbEa3gB_iBBLc-aL-S3p44A=&h=351&w=585&sz=30&hl=en&start=18&sig2=4MsskS33C9jSHQN0XkZ7uA&um=1&tbnid=GwpjEhCZiunjaM:&tbnh=81&tbnw=135&prev=/images%3Fq%3DProportional%2Bcircle%2Bmap%26hl%3Den%26safe%3Doff%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DG%26um%3D1&ei=L69XS_3kBI2vtgeL7MynBA)
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