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Atlasgeo.net: Greenland
http://www.atlasgeo.net/flags/anglais/html/Egreenland.htm
Animated GIF image.
Flags of the World: Greenland
http://flagspot.net/flags/gl.html
National and other proposed flags.
Theodora.com: Greenland Flags
http://www.geographic.org/flags/greenland_flags.html
Images in several sizes.