81 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-10-17 07:48:18
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82 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-08-31 10:55:05
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83 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2005-01-12 10:19:24
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84 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2005-11-01 09:20:23
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85 | Add to Reading ListSource URL: www.msha.govLanguage: English - Date: 2014-07-24 09:56:08
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86 | Add to Reading ListSource URL: www.msha.govLanguage: English - Date: 2014-07-24 09:56:19
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87 | Add to Reading ListSource URL: www.msha.govLanguage: English - Date: 2014-07-24 09:56:15
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88 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-04-16 07:25:32
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89 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-09-14 10:22:19
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90 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-02-26 15:34:22
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