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Atlasgeo.net: British Virgin Islands
http://www.atlasgeo.net/flags/anglais/html/Ebritishvirgin.htm
Animated GIF image.
Theodora.com: Flag of British Virgin Islands
http://www.geographic.org/flags/british_virgin_islands_flags.html
Images in several sizes.
World Flag Database: British Virgin Islands
http://www.flags.net/BVIS.htm
National flag, civil ensign, and country facts.