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Atlasgeo.net: Botswana
http://www.atlasgeo.net/flags/anglais/html/Ebotswana.htm
Animated GIF image.
Flags of the World: Botswana
http://flagspot.net/flags/bw.html
National flag explanation, legislation, and construction sheet, as well as military and political flags.
Theodora.com: Flag of Botswana
http://www.geographic.org/flags/botswana_flags.html
Images in several sizes and links to country facts.
World Flag Database: Botswana
http://www.flags.net/BOTS.htm
National flag and country details.