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| English thesaurus | |||
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| Central coordinating agencies of the NAV CANADA altitude reservation service for eastern Canada | |||
| altitude: 32 phrases in 8 subjects |
| Communications | 3 |
| Construction | 4 |
| Forestry | 1 |
| General | 1 |
| Meteorology | 1 |
| Surveying | 1 |
| Technology | 3 |
| Transport | 18 |