21 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2011-08-03 16:17:58
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22 | Add to Reading ListSource URL: ndep.nv.govLanguage: English - Date: 2012-07-25 12:47:53
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23 | Add to Reading ListSource URL: www.gpo.govLanguage: English - Date: 2013-09-10 14:52:25
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24 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2010-04-29 11:26:08
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25 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2007-06-07 16:59:19
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26 | Add to Reading ListSource URL: www.msha.govLanguage: English - Date: 2014-07-18 14:24:53
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27 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2006-07-20 06:01:12
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28 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2008-03-11 11:50:32
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29 | Add to Reading ListSource URL: mda.messe-dusseldorf.comLanguage: English - Date: 2014-06-11 22:26:08
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30 | Add to Reading ListSource URL: rruff.infoLanguage: English - Date: 2007-06-18 16:54:03
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