991 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-11-29 09:01:04
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992 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-04-04 13:50:08
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993 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-04-04 11:21:19
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994 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-11-29 09:02:06
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995 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-04-04 12:36:48
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996 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2013-01-04 12:06:30
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997 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-08-05 10:57:11
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998 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 16:58:33
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999 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-10-05 10:48:51
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1000 | Add to Reading ListSource URL: www.idph.state.ia.usLanguage: English - Date: 2011-03-01 15:40:10
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