31 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:16
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32 | Add to Reading ListSource URL: weirtonmuseum.comLanguage: English - Date: 2010-05-30 07:17:29
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33 | Add to Reading ListSource URL: www.dllr.maryland.govLanguage: English - Date: 2006-08-17 10:59:44
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34 | Add to Reading ListSource URL: www.intlmag.orgLanguage: English - Date: 2014-04-14 17:39:42
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35 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:16
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36 | Add to Reading ListSource URL: www.nationalslag.orgLanguage: English - Date: 2013-04-12 16:58:55
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37 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:16
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38 | Add to Reading ListSource URL: www.nationalslag.orgLanguage: English - Date: 2013-04-12 16:58:26
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39 | Add to Reading ListSource URL: www.dllr.state.md.usLanguage: English - Date: 2006-08-17 10:59:44
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40 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-11-19 12:56:14
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