51 | Add to Reading ListSource URL: www.bia.govLanguage: English - Date: 2014-05-01 04:53:38
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52 | Add to Reading ListSource URL: nmgs.nmt.eduLanguage: English - Date: 2009-12-09 17:36:47
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53 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2004-02-02 16:05:55
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54 | Add to Reading ListSource URL: www.petroriveroil.comLanguage: English - Date: 2012-12-17 15:12:12
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55 | Add to Reading ListSource URL: www1.eere.energy.govLanguage: English - Date: 2007-08-01 10:48:18
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56 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2001-12-04 14:41:07
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