31 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2012-11-05 11:03:22
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32 | Add to Reading ListSource URL: nature.nps.govLanguage: English - Date: 2006-04-05 13:53:51
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33 | Add to Reading ListSource URL: www.jenster.comLanguage: English - Date: 2007-06-04 14:11:20
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34 | Add to Reading ListSource URL: www.nbmg.unr.eduLanguage: English - Date: 2010-11-17 13:40:34
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35 | Add to Reading ListSource URL: ngmdb.usgs.govLanguage: English - Date: 2014-06-18 12:32:09
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36 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2006-09-19 14:55:34
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37 | Add to Reading ListSource URL: www.tips.osmre.govLanguage: English - Date: 2010-02-10 18:56:12
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38 | Add to Reading ListSource URL: ngmdb.usgs.govLanguage: English - Date: 2004-12-20 14:59:20
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39 | Add to Reading ListSource URL: ngmdb.usgs.govLanguage: English - Date: 2004-12-20 17:57:47
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40 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 17:01:32
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