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Atlasgeo.net: Italy
http://www.atlasgeo.net/flags/anglais/html/Eitaly.htm
Animated GIF image.
Flag of Sicily [geographic.org]
http://www.geographic.org/flags/new3/sicily_flags.html
Thumbnail, small and large GIF images of the flag of Sicily, suitable for use on web pages, which the author permits.
Flags of the World: Italy
http://flagspot.net/flags/it.html
National, subnational, historical, political, and military flags.
Sicilian Flags
http://www.duesicilie.org/bannere-sic.html
Current and past flags of Sicily.
The History of the Italian Flag
http://www.arcaini.com/ITALY/ItalianFlag/HistoryOfItalianFlag.htm
Information on the flag's adoption and changes over the years.
Theodora.com: Flag of Italy
http://www.geographic.org/flags/new1/italy_flags.html
Images in several sizes.