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| sistema de observación | |||
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Observing Systems : 35 phrases in 12 subjects |
| Communications | 1 |
| Environment | 3 |
| General | 2 |
| Geography | 1 |
| Life sciences | 1 |
| Marketing | 1 |
| Meteorology | 10 |
| Name of organization | 4 |
| Natural sciences | 3 |
| Remote sensing | 1 |
| Transport | 2 |
| United Nations | 6 |