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==External links==
* {{cite web |url= http://www.dcr.virginia.gov/soil_and_water/hu.shtml |title= Hydrologic Unit Geography |publisher= Virginia Department of Conservation & Recreation |accessdate= 21 November 2010}}
* {{cite web |url= http://ccm.jrc.ec.europa.eu |title= CCM2 Catchments and Rivers of Europe |publisher= Joint Research Center of the European Commission |accessdate= 13 September 2012}}
* {{cite web |url= http://web.archive.org/web/20070121122717/http://193.178.1.168/River_Coding_Review.pdf |title= Review of Existing River Coding Systems |publisher= European Coding Systems WFD GIS Working Group |accessdate= 29 September 2014}}
[[Category:Hydrology]]
[[Category:Limnology]]
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