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Atlasgeo.net: Jamaica
http://www.atlasgeo.net/flags/anglais/html/Ejamaica.htm
Animated GIF image.
Embassy of Jamaica: The Jamaican Flag
http://www.emjamusa.org/flag.htm
Specifications and symbolism.
Flags of the World: Jamaica
http://flagspot.net/flags/jm.html
National, governmental, military, and colonial flags.
Theodora.com: Flags of Jamaica
http://www.geographic.org/flags/jamaica_flags.html
Images in several sizes.