21 | Add to Reading ListSource URL: www.geus.dkLanguage: English - Date: 2014-02-09 09:42:00
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22 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2002-05-28 13:51:00
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23 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:01
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24 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:01
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25 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 16:55:41
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26 | Add to Reading ListSource URL: www.coloradomineralsociety.orgLanguage: English - Date: 2012-10-10 20:02:32
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27 | Add to Reading ListSource URL: novascotia.caLanguage: English - Date: 2010-09-13 11:20:27
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28 | Add to Reading ListSource URL: www.mta.gov.trLanguage: English - Date: 2012-07-27 02:39:54
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29 | Add to Reading ListSource URL: www.handbookofmineralogy.comLanguage: English - Date: 2007-09-30 02:50:00
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30 | Add to Reading ListSource URL: www.minsocam.orgLanguage: English - Date: 2007-04-04 00:12:02
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