21 | Add to Reading ListSource URL: www.maine.govLanguage: English - Date: 2013-07-26 10:22:54
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22 | Add to Reading ListSource URL: www.gov.mb.caLanguage: English - Date: 2014-06-09 11:02:18
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23 | Add to Reading ListSource URL: www.michigan.govLanguage: English - Date: 2012-12-07 20:22:10
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24 | Add to Reading ListSource URL: www.geology.sdsu.eduLanguage: English - Date: 2008-08-30 15:04:26
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25 | Add to Reading ListSource URL: www.msha.govLanguage: English - Date: 2014-07-24 09:55:36
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26 | Add to Reading ListSource URL: www.anr.state.vt.usLanguage: English - Date: 2012-04-24 14:20:10
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27 | Add to Reading ListSource URL: www.anr.state.vt.usLanguage: English - Date: 2012-11-07 13:20:02
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28 | Add to Reading ListSource URL: www.anr.state.vt.usLanguage: English - Date: 2012-12-14 11:52:15
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29 | Add to Reading ListSource URL: www.anr.state.vt.usLanguage: English - Date: 2011-11-01 16:01:25
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30 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2012-03-01 07:55:00
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