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Atlasgeo.net: Colombia
http://www.atlasgeo.net/flags/anglais/html/Ecolombia.htm
Animated GIF image.
Flags of the World: Colombia
http://flagspot.net/flags/co.html
National, historical, presidential, military, department, and municipality flags.
Theodora.com: Colombia Flags
http://www.geographic.org/flags/colombia_flags.html
Images in several sizes and links to country facts.