Search our collection of background (non-event) articles from news media, science journals and other sources.
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34 | 18 |
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7 | 9 | 8 | 8 | 5 | 1 | 4 | 2 | 4 | 3 | 1 |
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SPRING | 10 | |
SUMMER | 6 | |
FALL | 1 |
United States | 28 | |
Canada | 2 |