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Atlasgeo.net: Burundi
http://www.atlasgeo.net/flags/anglais/html/Eburundi.htm
Animated GIF image.
Flags of the World: Burundi
http://flagspot.net/flags/bi.html
National, historical, and political flags.
Theodora.com: Flag of Burundi
http://www.geographic.org/flags/burundi_flags.html
Images in several sizes.