21 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-01-31 09:52:26
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22 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-02-22 08:10:58
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23 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-11-15 12:22:40
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24 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-06-08 10:51:30
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25 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-05-24 13:53:31
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26 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2003-02-06 13:50:36
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27 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-08-31 10:51:45
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28 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-04-19 14:03:48
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29 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-08-03 09:42:28
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30 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-07-17 13:44:59
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