31 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-07-06 12:29:19
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32 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2004-02-11 18:17:57
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33 | Add to Reading ListSource URL: hera.ugr.esLanguage: English - Date: 2006-01-23 02:45:30
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34 | Add to Reading ListSource URL: www.lithoprobe.caLanguage: English - Date: 2009-03-28 03:59:43
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35 | Add to Reading ListSource URL: www.lithoprobe.caLanguage: English - Date: 2009-03-28 03:59:43
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36 | Add to Reading ListSource URL: darkwing.uoregon.eduLanguage: English - Date: 2010-03-29 18:17:59
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