Search our collection of background (non-event) articles from news media, science journals and other sources.
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| WINTER | 26 | |
| SUMMER | 24 | |
| SPRING | 23 | |
| FALL | 13 |
| United States | 52 | |
| Canada | 6 | |
| Norway | 4 | |
| Russia | 3 | |
| China | 2 | |
| Estonia | 1 | |
| Iceland | 1 | |
| Ireland | 1 | |
| Poland | 1 | |
| Spain | 1 | |
| United Kingdom | 1 |
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