181 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-02-01 09:03:01
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182 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-01-29 11:35:45
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183 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-01-24 13:54:58
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184 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-03-07 15:48:15
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185 | Add to Reading ListSource URL: www.mansfieldfdn.orgLanguage: English - Date: 2009-10-29 18:40:42
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186 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-01-13 10:50:50
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187 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2014-05-20 17:37:17
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188 | Add to Reading ListSource URL: s3.documentcloud.orgLanguage: English - Date: 2013-01-28 00:08:32
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189 | Add to Reading ListSource URL: www.grassley.senate.govLanguage: English - Date: 2014-08-01 12:27:37
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190 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2003-02-11 11:25:24
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