181 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-01-19 08:29:23
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182 | Add to Reading ListSource URL: www.nctm.orgLanguage: English - Date: 2014-05-29 10:42:44
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183 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-02-01 13:41:24
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184 | Add to Reading ListSource URL: www.sidw.orgLanguage: English - Date: 2013-11-06 17:04:51
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185 | Add to Reading ListSource URL: ntp.niehs.nih.govLanguage: English - Date: 2014-11-11 12:57:30
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186 | Add to Reading ListSource URL: navsource.orgLanguage: English - Date: 2010-04-18 16:14:28
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187 | Add to Reading ListSource URL: www.oregongeology.orgLanguage: English - Date: 2013-07-31 15:01:58
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188 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-03-07 16:38:45
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189 | Add to Reading ListSource URL: asr.science.energy.govLanguage: English - Date: 2014-03-06 16:30:36
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190 | Add to Reading ListSource URL: mining.state.co.usLanguage: English - Date: 2012-09-11 11:10:26
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