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| 一等三角測量 (いっとうさんかくそくりょう) River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 一等三角点 (いっとうさんかくてん) River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
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first order triangulation : 3 phrases in 2 subjects |
| General | 2 |
| Technology | 1 |