Search our collection of background (non-event) articles from news media, science journals and other sources.
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7 | 20 |
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10 | 3 | 2 | 1 | 2 | 1 | 2 | 1 | 1 | 4 |
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FALL | 1 | |
SPRING | 1 | |
SUMMER | 1 | |
WINTER | 1 |
United States | 12 | |
Canada | 1 |