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Atlasgeo.net: Mongolia
http://www.atlasgeo.net/flags/anglais/html/Emongolia.htm
Animated GIF image.
Flags of the World: Mongolia
http://flagspot.net/flags/mn.html
National, historical, and political flags.
Mongolia FAQ
http://userpage.fu-berlin.de/~corff/mfaq-3.html#ss3.4
Description and symbolism.
Theodora.com: Flag of Mongolia
http://www.geographic.org/flags/mongolia_flags.html
Images in several sizes.
World Flag Database: Mongolia
http://www.flags.net/MONG.htm
National flag and country details.