Search our collection of background (non-event) articles from news media, science journals and other sources.
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4 | 39 | 9 |
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12 | 1 | 1 | 3 | 4 | 1 | 1 | 2 | 1 | 6 | 10 | 10 |
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WINTER | 11 | |
FALL | 6 | |
SUMMER | 2 |
United States | 27 | |
Canada | 6 | |
Greenland | 1 |