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Atlasgeo.net: The Netherlands
http://www.atlasgeo.net/flags/anglais/html/Enetherlands.htm
Animated GIF image.
Dutch Flag and Coat of Arms
http://www.minbuza.nl/default.asp?CMS_ITEM=MBZ460652
History, heraldic description, and flag days, from the Ministry of Foreign Affairs.
Flags of the World: The Netherlands
http://flagspot.net/flags/nl.html
National, subnational, historical, governmental, and military flags.
Theodora.com: Flag of the Netherlands
http://www.geographic.org/flags/new1/netherlands_flags.html
Images in several sizes.
Theodora.com: Friesland Flag
http://www.geographic.org/flags/new1/friesland_flags.html
Images in several sizes.
World Flag Database: Netherlands
http://www.flags.net/NETH.htm
National and province flags and country facts.