51 | Add to Reading ListSource URL: www.ams.orgLanguage: English - Date: 2013-03-01 00:33:12
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52 | Add to Reading ListSource URL: aa.usno.navy.milLanguage: English - Date: 2014-11-21 14:29:23
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53 | Add to Reading ListSource URL: www.ias.ac.inLanguage: English - Date: 2014-11-12 00:50:36
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54 | Add to Reading ListSource URL: www.blm.govLanguage: English - Date: 2014-12-10 13:07:25
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55 | Add to Reading ListSource URL: fab.cba.mit.eduLanguage: English - Date: 2014-03-18 08:26:45
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56 | Add to Reading ListSource URL: vsgc.odu.eduLanguage: English - Date: 2007-09-17 12:11:26
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57 | Add to Reading ListSource URL: www.nefsc.noaa.govLanguage: English - Date: 2014-05-29 07:09:03
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58 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2007-07-16 17:30:42
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59 | Add to Reading ListSource URL: pfds.opensecrets.orgLanguage: English - Date: 2012-06-26 11:01:22
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60 | Add to Reading ListSource URL: www.pwrc.usgs.govLanguage: English - Date: 2012-12-19 08:10:28
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