1 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-12-04 08:33:24
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2 | Add to Reading ListSource URL: www.lhva.org- Date: 2014-08-05 14:16:44
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3 | Add to Reading ListSource URL: anthracitemuseum.orgLanguage: English - Date: 2010-03-07 20:08:27
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4 | Add to Reading ListSource URL: www.lhva.orgLanguage: English - Date: 2013-10-01 12:06:28
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5 | Add to Reading ListSource URL: www.thedaytheearthcavedin.comLanguage: English - Date: 2012-07-18 16:54:33
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6 | Add to Reading ListSource URL: www.anthracitemuseum.orgLanguage: English - Date: 2014-02-24 21:41:55
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7 | Add to Reading ListSource URL: pdfhost.focus.nps.govLanguage: English - Date: 2008-03-18 03:18:14
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