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| Arctic exploration | |||
| исследование Арктики: 17 phrases in 9 subjects |
| Ecology | 6 |
| General | 1 |
| Geography | 1 |
| Makarov | 2 |
| Military | 2 |
| Nautical | 2 |
| Sakhalin | 1 |
| Scientific | 1 |
| United States | 1 |
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