Search our collection of background (non-event) articles from news media, science journals and other sources.
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| SUMMER | 57 | |
| FALL | 56 | |
| WINTER | 52 | |
| SPRING | 32 |
| United States | 161 | |
| Canada | 29 | |
| Russia | 15 | |
| Norway | 7 | |
| Sweden | 3 | |
| Australia | 2 | |
| Iceland | 2 | |
| Afghanistan | 1 | |
| Denmark | 1 | |
| Estonia | 1 | |
| Faroe Islands | 1 | |
| Greece | 1 | |
| Greenland | 1 | |
| Guatemala | 1 | |
| Japan | 1 | |
| Saint Vincent and the Grenadines | 1 | |
| Spain | 1 | |
| Vietnam | 1 |
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