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Atlasgeo.net: Congo-Brazzaville
http://www.atlasgeo.net/flags/anglais/html/Econgobrazza.htm
Animated GIF image.
Flags of the World: Congo
http://flagspot.net/flags/cg.html
Current and historical flags, and relevant legislation.
Theodora.com: Flag of Congo
http://www.theodora.com/flags/congo_flags.html
Images in several sizes and links to country facts.