U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National MapArchived 2012-03-29 at the Wayback Machine, accessed April 1, 2011
vawildlife.org
"Recent Projects". The Wildlife Foundation of Virginia. Archived from the original on October 31, 2016. Retrieved January 1, 2017.
web.archive.org
U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National MapArchived 2012-03-29 at the Wayback Machine, accessed April 1, 2011
"Recent Projects". The Wildlife Foundation of Virginia. Archived from the original on October 31, 2016. Retrieved January 1, 2017.