Search our collection of background (non-event) articles from news media, science journals and other sources.
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2 | 1 | 3 | 4 | 1 | 5 | 5 | 1 | 4 | 2 | 7 | 1 |
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WINTER | 2 | |
FALL | 1 |
United States | 13 | |
Canada | 3 | |
Russia | 2 |