81 | Add to Reading ListSource URL: www.oregongeology.orgLanguage: English - Date: 2013-01-04 12:00:27
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82 | Add to Reading ListSource URL: nationalmap.govLanguage: English - Date: 2011-05-10 08:06:53
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83 | Add to Reading ListSource URL: calval.cr.usgs.govLanguage: English - Date: 2013-05-08 14:29:41
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84 | Add to Reading ListSource URL: crystal.isgs.uiuc.eduLanguage: English - Date: 2014-01-15 10:11:08
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85 | Add to Reading ListSource URL: www.nsgic.orgLanguage: English - Date: 2014-02-26 06:24:59
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86 | Add to Reading ListSource URL: www.csc.noaa.govLanguage: English - Date: 2013-07-24 16:10:17
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87 | Add to Reading ListSource URL: www.in.govLanguage: English - Date: 2014-07-01 16:55:09
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88 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2009-09-24 14:36:54
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89 | Add to Reading ListSource URL: topotools.cr.usgs.govLanguage: English - Date: 2010-02-05 11:14:51
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90 | Add to Reading ListSource URL: www.michigan.govLanguage: English - Date: 2013-01-29 10:59:23
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