51 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-07-17 14:10:01
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52 | Add to Reading ListSource URL: www.michigan.govLanguage: English - Date: 2012-12-07 20:17:46
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53 | Add to Reading ListSource URL: lcweb2.loc.govLanguage: English - Date: 2011-08-31 16:52:31
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54 | Add to Reading ListSource URL: marquette.orgLanguage: English - Date: 2014-06-13 15:45:38
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55 | Add to Reading ListSource URL: www.ggta.orgLanguage: English - Date: 2013-07-16 16:45:11
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56 | Add to Reading ListSource URL: www.stb.dot.govLanguage: English - Date: 2009-07-10 14:42:13
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57 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-05-29 10:36:32
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58 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2005-07-05 11:21:12
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59 | Add to Reading ListSource URL: www.americanart.si.eduLanguage: English - Date: 2012-02-10 09:16:35
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60 | Add to Reading ListSource URL: www.msha.govLanguage: English - Date: 2012-06-12 09:30:52
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