21 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2004-08-05 13:02:47
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22 | Add to Reading ListSource URL: www.nd.govLanguage: English - Date: 2010-11-22 08:33:51
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23 | Add to Reading ListSource URL: www.nd.govLanguage: English - Date: 2009-06-17 14:00:12
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24 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1997-04-02 08:20:38
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25 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-04-26 09:26:08
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26 | Add to Reading ListSource URL: www.vaclavsmil.comLanguage: English - Date: 2011-06-08 17:15:52
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27 | Add to Reading ListSource URL: www.vaclavsmil.comLanguage: English - Date: 2010-03-15 14:14:55
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28 | Add to Reading ListSource URL: www.nobelprize.orgLanguage: English - Date: 2008-09-22 08:02:21
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29 | Add to Reading ListSource URL: www.nobelprize.orgLanguage: English - Date: 2011-11-01 06:59:47
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30 | Add to Reading ListSource URL: www.medicine.nevada.eduLanguage: English - Date: 2010-09-24 02:26:22
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