These are:
Anker Nielsen is a member of ISJP - International
Society for Japanese Philately with a web-site http://isjp.org/isjp.html
The Japanese Stamps collector society - JPS (in Japan)
http://www.yushu.or.jp/
For a more general information on Japan, see for instance the Japanese turist organisation: http://www.jnto.go.jp/eng/
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