21 Aug, 2019
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current | 19:03, 6 September 2009 | 978 × 685 (763 KB) | Xenon54 | {{Information |Description={{en|1=WWV transmitter building in Beltsville, MD.}} |Source=http://tf.nist.gov/timefreq/general/pdf/1969.pdf - NIST Special Publication 250-67 |Author=NIST |Date=? |Permission={{PD-USGov-NIST}} |other_ |
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