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| 汚濁軽減 River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 汚染汚濁、 おだく防止 River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
| English thesaurus | |||
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| PA (Alex Lilo) | |||
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| 汚濁軽減 River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 汚染汚濁、 おだく防止 River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
| English thesaurus | |||
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| PA (Alex Lilo) | |||