| web | http://www.washingtonpost.com/world/national-security/nsa-surveillance-program-reaches-into-the-past-to-retrieve-replay-phone-calls/2014/03/18/226d2646-ade9-11e3-a49e-76adc9210f19_story.html |
| author | Barton Gellman and Ashkan Soltani |
| publication | Washington Post |
| date | 2014-03-18 |
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