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| astronomic ground control; astronomic control; astronomical ground control; astronomical control | |||
| астрономо-геодезические наблюдения: 10 phrases in 2 subjects |
| Cartography | 9 |
| Navigation | 1 |
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| |||
| astronomic ground control; astronomic control; astronomical ground control; astronomical control | |||
| астрономо-геодезические наблюдения: 10 phrases in 2 subjects |
| Cartography | 9 |
| Navigation | 1 |