Search our collection of background (non-event) articles from news media, science journals and other sources.
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| SUMMER | 16 | |
| SPRING | 5 | |
| FALL | 3 | |
| WINTER | 2 |
| United States | 20 | |
| Canada | 6 | |
| Russia | 2 | |
| Mexico | 1 | |
| Norway | 1 | |
| Saint Vincent and the Grenadines | 1 | |
| Sweden | 1 |
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