81 | Add to Reading ListSource URL: www.nature.nps.govLanguage: English - Date: 1999-10-06 12:11:57
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82 | Add to Reading ListSource URL: www.dnr.mo.govLanguage: English - Date: 2013-12-20 16:49:30
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83 | Add to Reading ListSource URL: rock.geosociety.orgLanguage: English - Date: 2012-03-16 13:50:19
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84 | Add to Reading ListSource URL: www.us23heritageroute.orgLanguage: English - Date: 2014-07-14 11:01:58
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85 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2011-06-29 13:03:28
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86 | Add to Reading ListSource URL: www.novascotiaparks.caLanguage: English - Date: 2013-03-25 07:48:24
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87 | Add to Reading ListSource URL: www.dnr.mo.govLanguage: English - Date: 2008-10-07 11:51:19
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88 | Add to Reading ListSource URL: www.itano.netLanguage: English - Date: 2013-09-30 19:01:55
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89 | Add to Reading ListSource URL: paleo.cortland.eduLanguage: English - Date: 2007-09-29 12:12:34
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90 | Add to Reading ListSource URL: www.kirj.eeLanguage: English - Date: 2014-05-28 03:53:57
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