11 | Add to Reading ListSource URL: arxiv.orgLanguage: English - Date: 2007-01-25 17:39:37
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12 | Add to Reading ListSource URL: www.okgenweb.orgLanguage: English - Date: 2008-04-18 09:25:13
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14 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2011-11-04 16:46:20
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16 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2000-03-13 11:00:00
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17 | Add to Reading ListSource URL: grfx.cstv.comLanguage: English - Date: 2013-09-24 09:41:19
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