71 | Add to Reading ListSource URL: www.gpo.govLanguage: English - Date: 2010-12-01 14:50:56
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72 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2007-11-05 11:59:42
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73 | Add to Reading ListSource URL: ardf.wr.usgs.govLanguage: English - Date: 2012-07-25 12:39:16
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74 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2007-11-05 13:10:24
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75 | Add to Reading ListSource URL: ardf.wr.usgs.govLanguage: English - Date: 2012-07-25 12:39:23
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76 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1998-02-19 14:07:04
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77 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:21
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78 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:21
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79 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1997-03-06 13:17:08
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80 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-08-05 10:57:07
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