Search our collection of background (non-event) articles from news media, science journals and other sources.
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13 | 4 | 7 | 13 | 13 | 3 | 5 | 5 | 4 | 2 | 4 | 5 |
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SPRING | 14 | |
WINTER | 10 | |
SUMMER | 6 | |
FALL | 4 |
United States | 36 | |
Canada | 6 | |
Norway | 2 | |
Russia | 1 | |
Sweden | 1 |