511 | Add to Reading ListSource URL: region8water.colostate.eduLanguage: English - Date: 2011-11-11 15:10:27
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512 | Add to Reading ListSource URL: fracfocus.orgLanguage: English - Date: 2013-02-08 15:02:08
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513 | Add to Reading ListSource URL: www.oilandgasinfo.caLanguage: English - Date: 2013-04-22 13:56:38
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514 | Add to Reading ListSource URL: energy.govLanguage: English - Date: 2014-03-05 13:02:57
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515 | Add to Reading ListSource URL: www.cectoxic.orgLanguage: English - Date: 2011-12-20 13:40:35
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516 | Add to Reading ListSource URL: library.ca.govLanguage: English - Date: 2014-06-13 12:25:06
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517 | Add to Reading ListSource URL: www.cectoxic.orgLanguage: English - Date: 2013-01-14 15:33:35
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518 | Add to Reading ListSource URL: www.novascotia.caLanguage: English - Date: 2012-07-31 08:22:17
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519 | Add to Reading ListSource URL: www.health.state.mn.usLanguage: English - Date: 2012-08-14 16:23:29
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520 | Add to Reading ListSource URL: www.csur.comLanguage: English - Date: 2012-10-26 11:23:12
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