211 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-01-17 14:17:03
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212 | Add to Reading ListSource URL: www.msha.govLanguage: English - Date: 2012-06-12 09:30:52
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213 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-01-31 10:07:37
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214 | Add to Reading ListSource URL: files.dnr.state.mn.usLanguage: English - Date: 2007-06-29 09:03:57
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215 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2010-08-30 09:31:21
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216 | Add to Reading ListSource URL: www.cliffsnaturalresources.comLanguage: English - Date: 2012-08-30 15:46:05
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217 | Add to Reading ListSource URL: ccl.design.umn.eduLanguage: English - Date: 2008-01-09 14:58:49
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218 | Add to Reading ListSource URL: files.dnr.state.mn.usLanguage: English - Date: 2009-07-08 12:30:49
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219 | Add to Reading ListSource URL: collections.mnhs.orgLanguage: English - Date: 2007-12-05 18:08:54
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220 | Add to Reading ListSource URL: files.dnr.state.mn.usLanguage: English - Date: 2013-04-30 10:52:32
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