11 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-10-25 10:53:56
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12 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-08-06 14:17:38
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13 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2003-12-24 08:54:06
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14 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2005-11-08 14:07:50
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15 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-08-06 14:17:37
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16 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-11-01 14:57:43
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17 | Add to Reading ListSource URL: www.cnri.reston.va.usLanguage: English - Date: 2009-12-07 11:22:13
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18 | Add to Reading ListSource URL: www.nixonlibrary.govLanguage: English - Date: 2012-06-19 15:24:57
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19 | Add to Reading ListSource URL: www.fordlibrarymuseum.govLanguage: English - Date: 2013-01-09 12:24:33
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