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| 1 | Basic Policies for the Protection of Water Quality in Water Resources Area for the Purpose of Preventing Specific Trouble | 特定水道利水障害の防止のための水道水源水域の水質の保全に関する基本方針 | |||
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| 1 | Basic Policies for the Protection of Water Quality in Water Resources Area for the Purpose of Preventing Specific Trouble | 特定水道利水障害の防止のための水道水源水域の水質の保全に関する基本方針 | |||
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