11 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-12-11 16:59:50
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12 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2009-12-04 16:13:25
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13 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2001-02-22 03:00:00
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14 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-04-28 12:06:52
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15 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-12-28 14:40:19
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16 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-12-28 14:07:18
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