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Atlasgeo.net: Guam
http://www.atlasgeo.net/flags/anglais/html/Eguam.htm
Animated GIF image.
Flags of the World: Guam
http://flagspot.net/flags/gu.html
National and variant flags.
Theodora.com: Flag of Guam
http://www.theodora.com/flags/guam_flags.html
Images in several sizes and links to country facts.