991 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2010-01-27 08:26:15
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992 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-14 15:37:01
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993 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-01-29 11:01:35
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994 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-06-08 10:51:33
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995 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-05-07 10:04:34
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996 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2009-01-29 14:31:06
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997 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-01-31 09:52:26
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998 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-06-08 10:51:31
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999 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-02-22 08:10:58
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1000 | Add to Reading ListSource URL: www.dllr.state.md.usLanguage: English - Date: 2006-08-17 10:59:44
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