11 | Add to Reading ListSource URL: www.oilheritage.orgLanguage: English - Date: 2005-07-01 14:30:20
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12 | Add to Reading ListSource URL: www.oilheritage.orgLanguage: English - Date: 2007-04-19 11:04:53
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13 | Add to Reading ListSource URL: www.oilheritage.orgLanguage: English - Date: 2006-04-12 16:00:06
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14 | Add to Reading ListSource URL: www.oilheritage.orgLanguage: English - Date: 2006-02-14 15:14:13
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15 | Add to Reading ListSource URL: www.oilheritage.orgLanguage: English - Date: 2005-07-01 14:30:16
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16 | Add to Reading ListSource URL: www.oilheritage.orgLanguage: English - Date: 2006-04-12 16:00:17
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17 | Add to Reading ListSource URL: archive.stsci.eduLanguage: English - Date: 2010-04-13 13:34:04
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18 | Add to Reading ListSource URL: www.dcnr.state.pa.usLanguage: English - Date: 2013-06-25 08:33:17
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19 | Add to Reading ListSource URL: www.drakewell.orgLanguage: English - Date: 2012-07-06 10:35:39
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20 | Add to Reading ListSource URL: www.drakewell.orgLanguage: English - Date: 2010-11-10 10:16:22
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