81 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-12-28 14:07:18
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82 | Add to Reading ListSource URL: www.lib.utexas.eduLanguage: English - Date: 2001-05-16 12:42:27
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83 | Add to Reading ListSource URL: www.lib.utexas.eduLanguage: English - Date: 2001-05-16 12:46:15
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84 | Add to Reading ListSource URL: hfc.nps.govLanguage: English - Date: 2011-12-14 09:55:09
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85 | Add to Reading ListSource URL: elib.dlr.deLanguage: English - Date: 2013-12-12 16:10:32
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86 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2011-06-09 16:53:30
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87 | Add to Reading ListSource URL: www.ipgp.frLanguage: English - Date: 2007-08-21 08:06:35
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88 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2006-07-18 16:33:38
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89 | Add to Reading ListSource URL: www.geo.mtu.eduLanguage: English - Date: 2008-04-29 17:21:56
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90 | Add to Reading ListSource URL: www.zgw-online.deLanguage: German - Date: 2008-10-05 14:04:28
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