Search our collection of background (non-event) articles from news media, science journals and other sources.
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| WINTER | 28 | |
| SPRING | 20 | |
| SUMMER | 20 | |
| FALL | 11 |
| United States | 71 | |
| Canada | 10 | |
| Russia | 4 | |
| Estonia | 1 | |
| Saint Vincent and the Grenadines | 1 | |
| Vietnam | 1 |
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