211 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-05-17 16:58:33
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212 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-06-24 15:27:41
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213 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-06-21 10:55:02
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214 | Add to Reading ListSource URL: www.migeweb.orgLanguage: English - Date: 2010-04-25 22:09:16
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215 | Add to Reading ListSource URL: www.azgs.az.govLanguage: English - Date: 2011-10-05 02:04:30
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216 | Add to Reading ListSource URL: geology.utah.govLanguage: English - Date: 2003-06-04 11:47:01
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217 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-11-02 16:22:48
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218 | Add to Reading ListSource URL: wisconsingeologicalsurvey.orgLanguage: English - Date: 2011-03-28 17:21:04
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219 | Add to Reading ListSource URL: www.cspg.orgLanguage: English - Date: 2013-01-02 23:14:56
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220 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2011-06-30 09:07:23
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