81 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-01-18 15:20:20
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82 | Add to Reading ListSource URL: media.rtl.nlLanguage: Dutch - Date: 2011-03-21 16:44:10
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83 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2001-07-24 11:02:36
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84 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-11-05 16:41:07
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85 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-12-13 16:31:18
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86 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-11-22 12:14:14
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87 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2001-08-21 09:48:45
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88 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2003-08-26 17:45:49
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89 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-06-14 10:46:53
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90 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2005-01-12 11:22:23
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