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Atlasgeo.net: Iran
http://www.atlasgeo.net/flags/anglais/html/Eiran.htm
Animated GIF image.
Flags of the World: Iran
http://flagspot.net/flags/ir.html
National, military, historical, and political flags.
Theodora.com: Flags of Iran
http://www.theodora.com/flags/new/iran_flags.html
Images in several sizes.