51 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2013-11-06 17:00:41
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52 | Add to Reading ListSource URL: www.gpo.govLanguage: English - Date: 2013-05-02 13:56:25
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53 | Add to Reading ListSource URL: www.angelo.eduLanguage: English - Date: 2012-08-24 17:04:53
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54 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-11-12 21:16:22
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55 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2014-12-08 16:58:21
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56 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2014-12-09 18:24:41
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57 | Add to Reading ListSource URL: mshinstitute.orgLanguage: English - Date: 2014-12-29 12:35:41
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58 | Add to Reading ListSource URL: www.washingtonhistory.orgLanguage: English - Date: 2014-12-17 14:58:09
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59 | Add to Reading ListSource URL: academics.holycross.eduLanguage: English - Date: 2013-12-03 11:41:07
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60 | Add to Reading ListSource URL: academics.holycross.eduLanguage: English - Date: 2013-12-03 11:41:06
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