81 | Add to Reading ListSource URL: eeb.ku.eduLanguage: English - Date: 2013-12-22 12:18:08
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82 | Add to Reading ListSource URL: eeb.ku.eduLanguage: English - Date: 2013-12-22 12:22:56
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83 | Add to Reading ListSource URL: phys.orgLanguage: English - Date: 2014-10-27 21:59:08
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84 | Add to Reading ListSource URL: eeb.ku.eduLanguage: English - Date: 2013-12-22 12:22:47
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85 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2014-02-13 15:00:55
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86 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2011-02-11 12:46:55
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87 | Add to Reading ListSource URL: www.americangeosciences.orgLanguage: English - Date: 2014-08-14 09:45:41
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88 | Add to Reading ListSource URL: www.tarpits.orgLanguage: English - Date: 2014-08-12 17:54:57
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89 | Add to Reading ListSource URL: eeb.ku.eduLanguage: English - Date: 2013-12-22 12:21:28
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90 | Add to Reading ListSource URL: www.tarpits.orgLanguage: English - Date: 2014-08-12 17:43:43
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