21 | Add to Reading ListSource URL: www.uwgb.eduLanguage: English - Date: 2008-04-25 08:58:12
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22 | Add to Reading ListSource URL: www.archaeomagnetism.comLanguage: English - Date: 2011-03-23 22:07:38
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23 | Add to Reading ListSource URL: www.uibk.ac.atLanguage: English - Date: 2006-11-13 04:55:29
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24 | Add to Reading ListSource URL: www.fns.uniba.skLanguage: English - Date: 2008-06-30 11:22:13
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25 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2011-03-09 10:54:22
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26 | Add to Reading ListSource URL: speleogenesis.infoLanguage: English - Date: 2010-04-13 09:05:12
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27 | Add to Reading ListSource URL: www.caves.orgLanguage: English - Date: 2008-03-06 13:35:20
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28 | Add to Reading ListSource URL: www.caves.orgLanguage: English - Date: 2008-03-06 13:33:20
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