421 | Add to Reading ListSource URL: www.geology.sdsu.eduLanguage: English - Date: 2008-08-30 15:04:25
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422 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-06-08 10:53:10
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423 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-01-31 10:08:54
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424 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-07-02 06:33:14
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425 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1996-10-10 08:27:04
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426 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1997-05-09 14:05:59
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427 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1997-06-19 07:54:54
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428 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-01-31 09:57:05
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429 | Add to Reading ListSource URL: www.ima-europe.euLanguage: English - Date: 2014-07-23 04:10:36
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430 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2005-10-31 15:09:29
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