Search our collection of background (non-event) articles from news media, science journals and other sources.
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39 | ||
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3 | ||
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13 | 26 |
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7 | 4 | 4 | 2 | 4 | 4 | 4 | 2 | 4 | 3 | 1 |
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FALL | 1 | |
SUMMER | 1 |
United States | 20 | |
Canada | 3 |