It's hard to generalize.
River basins of the US in rainbow colours by GrasshopperGeography https://t.co/0hkvC7TzGp via @Etsy — Douglas Allen (@DouglasHAllen) October 24, 2016
River basins of the US in rainbow colours by GrasshopperGeography https://t.co/0hkvC7TzGp via @Etsy
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