21 | Add to Reading ListSource URL: nature.nps.govLanguage: English - Date: 1999-10-06 12:00:18
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22 | Add to Reading ListSource URL: www.edinburghgeolsoc.orgLanguage: English - Date: 2010-09-27 10:06:21
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23 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2006-03-01 10:18:31
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24 | Add to Reading ListSource URL: www.smu.caLanguage: English - Date: 2013-07-22 13:41:50
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25 | Add to Reading ListSource URL: www.ussher.org.ukLanguage: English - Date: 2011-09-13 10:29:05
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26 | Add to Reading ListSource URL: www.edinburghgeolsoc.orgLanguage: English - Date: 2011-12-02 01:23:26
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27 | Add to Reading ListSource URL: www.devon.gov.ukLanguage: English - Date: 2007-11-21 08:06:25
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28 | Add to Reading ListSource URL: geowords.comLanguage: English - Date: 2012-08-20 20:45:18
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29 | Add to Reading ListSource URL: nagt.orgLanguage: English - Date: 2005-03-14 12:26:22
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