11 | Add to Reading ListSource URL: www.blm.govLanguage: English - Date: 2014-10-02 11:17:36
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12 | Add to Reading ListSource URL: www.blm.govLanguage: English - Date: 2014-08-21 14:51:58
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13 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2011-08-18 15:03:30
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14 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2011-08-17 11:41:00
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15 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-09-14 12:03:07
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16 | Add to Reading ListSource URL: www.handbookofmineralogy.orgLanguage: English - Date: 2007-09-30 02:26:32
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17 | Add to Reading ListSource URL: yosemite.epa.govLanguage: English - Date: 2013-09-10 17:42:15
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18 | Add to Reading ListSource URL: www.handbookofmineralogy.comLanguage: English - Date: 2007-09-30 01:43:30
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19 | Add to Reading ListSource URL: www.handbookofmineralogy.comLanguage: English - Date: 2007-09-30 02:26:32
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20 | Add to Reading ListSource URL: www.handbookofmineralogy.comLanguage: English - Date: 2007-09-30 01:15:50
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