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http://www.kankyo-hoshano.go.jp/08/ers_lib/ers_abs49.pdf
http://www.union.tokyo23seisou.lg.jp/gijutsu/kankyo/kumiai/oshirase/hoshano/documents/shoukyakubai_240604.pdf
https://www.city.sodegaura.lg.jp/soshiki/haikibutsu/houshaichiran.html

19