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| オープンウェル法 River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
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| 井筒工法 (いづつこうほう) Concrete Terminology Glossary (Gururaj Rao) | |||
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| オープンウェル法 River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
| |||
| 井筒工法 (いづつこうほう) Concrete Terminology Glossary (Gururaj Rao) | |||
