31 | Add to Reading ListSource URL: www.arizonahistoricalsociety.orgLanguage: English - Date: 2013-03-19 11:12:00
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32 | Add to Reading ListSource URL: www.arizonahistoricalsociety.orgLanguage: English - Date: 2013-05-16 09:41:26
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33 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2006-07-21 12:24:09
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34 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-09 11:13:37
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35 | Add to Reading ListSource URL: www.asarco.comLanguage: English - Date: 2012-01-25 16:40:11
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36 | Add to Reading ListSource URL: www.udallcenter.arizona.eduLanguage: English - Date: 2013-02-12 15:20:35
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37 | Add to Reading ListSource URL: seagoedd.orgLanguage: English - Date: 2012-05-01 16:10:47
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38 | Add to Reading ListSource URL: www.dol.govLanguage: English - Date: 2014-02-28 11:42:39
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39 | Add to Reading ListSource URL: udallcenter.arizona.eduLanguage: English - Date: 2013-02-12 15:20:35
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40 | Add to Reading ListSource URL: chroniclingamerica.loc.govLanguage: English - Date: 2010-11-29 14:03:00
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