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All About Japan: Japanese Flag
http://www.geocities.com/Tokyo/Bay/6221/JpFlag.html
Image of the national flag suitable for printing.
Atlasgeo.net: Japan
http://www.atlasgeo.net/flags/anglais/html/Ejapan.htm
Animated GIF image.
Flags of the World: Japan
http://flagspot.net/flags/jp.html
National, governmental, royal, feudal, military, prefecture, and municipal flags.
Japan Access: National Flag and Anthem
http://web-japan.org/factsheet/flag/
History and contemporary use of the flag.
Japanese Flags
http://www.japanorama.com/hinomaru.html
National, World War II, and Emperor's flags.
Theodora.com: Flag of Japan
http://www.geographic.org/flags/new1/japan_flags.html
Images in several sizes.