| web | https://www.cbsnews.com/news/climate-change-drought-california-western-united-states-study/ |
| author | Jeff Berardelli |
| publication | CBS News |
| date | 2020-04-17 |
| web | A. Park Williams1, Edward R. C... | Science | 2020-04-17 | |
| web | Matt McGrath | BBC |
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