| web | http://www.nytimes.com/2015/05/05/science/earth/fracking-chemicals-detected-in-pennsylvania-drinking-water.html?_r=1 |
| author | Nicholas St. Fleur |
| publication | New York Times |
| date | 2015-05-04 |
| web | Garth T. Llewellyn, Frank Dorm... | PNAS | 2015-04-02 |
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