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| 二等水準測 River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 二等水準点 (にとうすいじゅんてん) River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
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| 二等水準測 River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 二等水準点 (にとうすいじゅんてん) River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
