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Atlasgeo.net: Hong Kong
http://www.atlasgeo.net/flags/anglais/html/Ehongkong.htm
Animated GIF image.
Flags of the World: Hong Kong
http://flagspot.net/flags/hk.html
Current and historical flags, related laws, and houseflags.
Government Information Centre: Flags & Emblems
http://www.info.gov.hk/protocol/eng/
Specifications, standards, and usage guidelines for the national and regional flags and emblems.
Theodora.com: Flags of Hong Kong
http://www.geographic.org/flags/new1/hong_kong_flags.html
Images in several sizes.
World Flag Database: Hong Kong
http://www.flags.net/HOKN.htm
Current and past flags and country facts.