http://www.onjix.com/paddle/index.html
http://www.onjix.com/paddle/outdoor/seakayak/seakayak07.html
http://www.kyoto-seika.ac.jp/assembly/1999/noda/
http://magma.nationalgeographic.com/ngm/0210/feature2/assignment1.html
http://www1.odn.ne.jp/bambriarsilk/my%20library.htm
