81 | Add to Reading ListSource URL: www.nhdfl.orgLanguage: English - Date: 2010-03-29 15:57:37
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82 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-02-09 15:21:27
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83 | Add to Reading ListSource URL: forestry.alabama.govLanguage: English - Date: 2009-07-21 16:27:36
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84 | Add to Reading ListSource URL: greatscienceforgirls.orgLanguage: English - Date: 2010-04-15 16:48:27
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85 | Add to Reading ListSource URL: c-spa.orgLanguage: English - Date: 2013-02-20 14:32:00
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86 | Add to Reading ListSource URL: www.nhdfl.orgLanguage: English - Date: 2007-07-02 18:44:28
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87 | Add to Reading ListSource URL: www.nhdfl.orgLanguage: English - Date: 2010-03-26 14:21:13
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88 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-02-14 12:53:22
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89 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-01-19 08:57:06
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90 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2003-02-11 12:10:36
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