U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map互联网档案馆的存檔,存档日期March 29, 2012,.. Retrieved August 15, 2011
potomacriver.org
Facts & FAQs. Interstate Commission on the Potomac River Basin (ICPRB), Rockville, MD. September 16, 2009 [2010-02-05]. (原始内容存档于January 15, 2010).
web.archive.org
U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map互联网档案馆的存檔,存档日期March 29, 2012,.. Retrieved August 15, 2011
Facts & FAQs. Interstate Commission on the Potomac River Basin (ICPRB), Rockville, MD. September 16, 2009 [2010-02-05]. (原始内容存档于January 15, 2010).