http://rhtrav.com/wordpress/us-streamflow-map-is-exercise-in-intricacy/?utm_source=TravTalkNewsletterlist&utm_campaign=1b0f189435-TravTalk_No_11_2013&utm_medium=email&utm_term=0_31a644a2ae-1b0f189435-346563889

A thing of beauty for map geeks everywhere.

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