51 | Add to Reading ListSource URL: ilrs.gsfc.nasa.govLanguage: English - Date: 2012-11-30 10:29:41
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52 | Add to Reading ListSource URL: www.unoosa.orgLanguage: English - Date: 2013-11-22 04:49:30
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53 | Add to Reading ListSource URL: ilrs.gsfc.nasa.govLanguage: English - Date: 2012-07-19 10:19:38
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54 | Add to Reading ListSource URL: www.itu.intLanguage: English - Date: 2014-11-07 06:32:07
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55 | Add to Reading ListSource URL: aa.usno.navy.milLanguage: English - Date: 2014-11-21 14:29:26
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56 | Add to Reading ListSource URL: www.noaasis.noaa.govLanguage: English - Date: 2004-09-17 14:58:47
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57 | Add to Reading ListSource URL: tf.nist.govLanguage: English - Date: 2000-12-28 17:14:12
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58 | Add to Reading ListSource URL: www.ntia.doc.govLanguage: English - Date: 2014-03-25 12:35:02
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59 | Add to Reading ListSource URL: www.ntia.doc.govLanguage: English - Date: 2012-10-02 14:09:19
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60 | Add to Reading ListSource URL: www.ntia.doc.govLanguage: English - Date: 2013-12-19 11:48:22
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