51 | Add to Reading ListSource URL: crossroadsarchive.netLanguage: English - Date: 2011-02-27 16:09:57
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52 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2016-12-20 14:01:40
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53 | Add to Reading ListSource URL: downloads.wvgs.wvnet.eduLanguage: English - Date: 2012-07-24 12:16:00
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54 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-03-16 10:45:23
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55 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-02-14 11:57:42
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56 | Add to Reading ListSource URL: www.wrb.ri.govLanguage: English - Date: 2015-01-22 08:25:15
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57 | Add to Reading ListSource URL: www.uky.eduLanguage: English - Date: 2015-09-30 09:35:59
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58 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2018-02-16 07:25:00
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59 | Add to Reading ListSource URL: www.dmr.nd.govLanguage: English - Date: 2009-01-28 16:06:41
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60 | Add to Reading ListSource URL: www.dmr.nd.govLanguage: English - Date: 2007-02-08 09:48:50
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