21 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2005-01-12 10:19:53
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22 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-03-24 10:35:38
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23 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-01-29 11:10:29
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24 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-01-18 13:32:54
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25 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-01-24 11:02:49
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26 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-08-31 10:55:39
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27 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2005-10-25 10:16:31
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28 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-10-11 11:09:09
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29 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-11-20 11:51:46
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30 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-10-30 07:59:02
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