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| 1 | designation of water area types of rivers under the Environmental Quality Standards for Water Pollution for the Preservation of Aquatic Life | 水生生物の保全に係る水質環境基準の類型指定 | |||
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| 1 | designation of water area types of rivers under the Environmental Quality Standards for Water Pollution for the Preservation of Aquatic Life | 水生生物の保全に係る水質環境基準の類型指定 | |||
