111 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 17:00:31
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112 | Add to Reading ListSource URL: www.anr.state.vt.usLanguage: English - Date: 2012-12-03 14:27:57
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113 | Add to Reading ListSource URL: www.anr.state.vt.usLanguage: English - Date: 2011-12-19 10:45:25
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114 | Add to Reading ListSource URL: borderhealth.cr.usgs.govLanguage: English - Date: 2005-03-16 12:38:44
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115 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2014-06-19 16:51:19
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116 | Add to Reading ListSource URL: education.usgs.govLanguage: English - Date: 2013-08-14 18:59:38
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117 | Add to Reading ListSource URL: www.migeweb.orgLanguage: English - Date: 2010-04-25 22:06:01
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118 | Add to Reading ListSource URL: wisconsingeologicalsurvey.orgLanguage: English - Date: 2011-03-28 17:21:06
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119 | Add to Reading ListSource URL: www.hartleynature.orgLanguage: English - Date: 2011-09-20 10:24:01
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120 | Add to Reading ListSource URL: geology.utah.govLanguage: English - Date: 2003-06-04 11:47:01
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