71 | Add to Reading ListSource URL: www.itu.intLanguage: English - Date: 2005-12-12 10:00:00
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72 | Add to Reading ListSource URL: www.fig.netLanguage: English - Date: 2013-08-20 04:08:09
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73 | Add to Reading ListSource URL: epncb.oma.beLanguage: English - Date: 2012-05-08 05:09:48
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74 | Add to Reading ListSource URL: science.nasa.govLanguage: English - Date: 2015-01-02 08:51:13
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75 | Add to Reading ListSource URL: www.geodesy.noaa.govLanguage: English - Date: 2013-11-04 07:50:49
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76 | Add to Reading ListSource URL: www.arrl.orgLanguage: English - Date: 2011-03-04 11:51:03
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77 | Add to Reading ListSource URL: www.sutron.comLanguage: English - Date: 2014-06-30 17:44:53
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78 | Add to Reading ListSource URL: www.geodesy.noaa.govLanguage: English - Date: 2014-01-08 17:03:58
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79 | Add to Reading ListSource URL: www.arrl.orgLanguage: English - Date: 2011-03-04 10:09:06
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80 | Add to Reading ListSource URL: www.atsc.orgLanguage: English - Date: 2009-11-10 15:03:31
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