21 | Add to Reading ListSource URL: www.pwypusa.orgLanguage: English - Date: 2011-05-26 07:44:30
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22 | Add to Reading ListSource URL: www.miningrocks.net.Language: English - Date: 2012-08-23 13:03:02
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23 | Add to Reading ListSource URL: www.miningrocks.netLanguage: English - Date: 2012-08-23 13:03:02
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24 | Add to Reading ListSource URL: www.petrochina.com.cnLanguage: English - Date: 2014-04-30 02:33:42
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25 | Add to Reading ListSource URL: www.eia.govLanguage: English - Date: 2013-02-21 16:57:54
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26 | Add to Reading ListSource URL: www.ceri-mines.orgLanguage: English - Date: 2011-05-23 19:51:25
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27 | Add to Reading ListSource URL: www.sdnp.joLanguage: English - Date: 2006-10-25 17:00:00
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28 | Add to Reading ListSource URL: www.kirj.eeLanguage: English - Date: 2007-10-10 03:55:24
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29 | Add to Reading ListSource URL: www.kirj.eeLanguage: English - Date: 2007-10-10 03:57:46
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30 | Add to Reading ListSource URL: www.nra.gov.joLanguage: English - Date: 2007-09-19 09:30:01
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