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Atlasgeo.net: Ireland
http://www.atlasgeo.net/flags/anglais/html/Eireland.htm
Animated GIF image.
Flags of Ireland
http://www.geocities.com/Athens/Sparta/1648/
National, Green, provincial, county, Sunburst, and Northern Ireland flags. [English and Irish]
Flags of the World: Ireland
http://flagspot.net/flags/ie.html
National, military, Green, provincial, county, city, and historical flags.
Theodora.com: Flag of Ireland
http://www.geographic.org/flags/new1/ireland_flags.html
Images in several sizes.