http://pubs.usgs.gov/fs/fs-004-03/
Range Graded Proportional Circle maps are not continuous because the data is at a fixed point. The size of the circle significantly correlates with the value of the data the map is illustrate. This map is a map of Lewis and Clark's expedition across the United States. The map above circle sizes indicates the size of the width of the canal. The key shows rivers that is navigable by three options, boat, canoe and pirogues, or its not navigable at all.
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