Search our collection of background (non-event) articles from news media, science journals and other sources.
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9 | 10 | 51 | 27 |
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15 | 5 | 8 | 15 | 14 | 5 | 8 | 6 | 5 | 4 | 6 | 6 |
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SPRING | 18 | |
WINTER | 14 | |
SUMMER | 12 | |
FALL | 8 |
United States | 45 | |
Canada | 8 | |
Norway | 3 | |
Russia | 1 | |
Sweden | 1 |