31 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2000-03-07 08:20:50
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32 | Add to Reading ListSource URL: www.arrl.orgLanguage: English - Date: 2013-11-14 16:15:54
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33 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2013-01-29 11:48:54
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34 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2008-02-01 09:11:48
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35 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2002-02-14 12:58:03
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36 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2010-01-27 09:52:04
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37 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2011-01-24 13:25:34
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38 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2004-01-13 11:24:40
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39 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2005-01-12 11:53:36
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40 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2006-01-19 08:27:41
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