191 | Add to Reading ListSource URL: www.hort.vt.eduLanguage: English - Date: 2006-12-13 16:33:32
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192 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2010-01-27 09:46:37
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193 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1997-03-10 11:31:19
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194 | Add to Reading ListSource URL: www.nhdfl.orgLanguage: English - Date: 2010-03-29 15:57:37
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195 | Add to Reading ListSource URL: pubs.ext.vt.eduLanguage: English - Date: 2014-09-04 11:46:57
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196 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-02-09 15:21:27
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197 | Add to Reading ListSource URL: www.ciesin.columbia.eduLanguage: English - Date: 2013-02-13 18:08:06
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198 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-08-21 07:24:54
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199 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-02-01 12:18:48
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200 | Add to Reading ListSource URL: greatscienceforgirls.orgLanguage: English - Date: 2010-04-15 16:48:27
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