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- climatology (1)
- cold (1)
- ecology (1)
- effect of environment on (1)
- human beings (1)
- manners and customs (1)
- national characteristics, russian (1)
- octopuses (1)
- russia (federation) (1)
- sharks (1)
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- winter (1)
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- 普列汉诺夫 (1)
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