Search our collection of background (non-event) articles from news media, science journals and other sources.
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| FALL | 13 | |
| WINTER | 13 |
| United States | 36 | |
| Canada | 9 | |
| Russia | 3 | |
| Iceland | 2 | |
| Mongolia | 2 | |
| Greenland | 1 | |
| Spain | 1 | |
| Sweden | 1 | |
| Trinidad and Tobago | 1 |
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