U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National MapArxivat 2012-03-29 a Wayback Machine., accessed October 5, 2012
U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National MapArxivat 2012-03-29 a Wayback Machine., accessed October 5, 2012