41 | Add to Reading ListSource URL: www.insg.orgLanguage: English - Date: 2014-04-05 18:37:43
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42 | Add to Reading ListSource URL: www.bir.orgLanguage: English - Date: 2013-11-04 05:25:03
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43 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2005-11-01 11:54:00
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44 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-11-14 15:57:22
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45 | Add to Reading ListSource URL: www.fs.usda.govLanguage: English - Date: 2009-10-28 10:08:19
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46 | Add to Reading ListSource URL: www.roxburylandtrust.orgLanguage: English - Date: 2010-03-21 14:10:51
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47 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2006-06-21 13:26:04
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48 | Add to Reading ListSource URL: www.psb.gov.auLanguage: English - Date: 2013-08-08 19:42:10
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49 | Add to Reading ListSource URL: www.negauneerodandgun.comLanguage: English - Date: 2014-06-23 10:42:52
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50 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-11-07 09:29:28
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