531 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-01-31 14:59:07
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532 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-01-17 13:39:07
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533 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-01-24 11:07:54
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534 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-03-07 15:13:33
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535 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-01-31 14:50:14
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536 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-01-24 11:49:54
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537 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2009-01-29 15:00:07
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538 | Add to Reading ListSource URL: epa.govLanguage: English - Date: 2012-04-04 11:50:21
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539 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-08-15 09:00:46
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540 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-05-07 07:30:24
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