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| Ｌ形ブロック River and Water Resources Glossary (Infrastructure Development Institute Japan) ; Ｌ型ブロック River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
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| Ｌ形ブロック River and Water Resources Glossary (Infrastructure Development Institute Japan) ; Ｌ型ブロック River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
