31![](https://www.pdfsearch.io/img/3f3d1faaba1fd264fbdf3a019e7ef57e.jpg) | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-07-06 12:29:19
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32![](https://www.pdfsearch.io/img/7d9abe80fa3bf748f64e1d4859a18be7.jpg) | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2004-02-11 18:17:57
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33![](https://www.pdfsearch.io/img/171afe361cd708762910f05b6765508b.jpg) | Add to Reading ListSource URL: hera.ugr.esLanguage: English - Date: 2006-01-23 02:45:30
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34![](https://www.pdfsearch.io/img/d9dcb6fea74dde8c93f501e1c4960aec.jpg) | Add to Reading ListSource URL: www.lithoprobe.caLanguage: English - Date: 2009-03-28 03:59:43
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35![](https://www.pdfsearch.io/img/584b5e2186065ecf6d57167edf44d18c.jpg) | Add to Reading ListSource URL: www.lithoprobe.caLanguage: English - Date: 2009-03-28 03:59:43
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36![](https://www.pdfsearch.io/img/3b4cc514d1f923a23c7787f25b4b38d4.jpg) | Add to Reading ListSource URL: darkwing.uoregon.eduLanguage: English - Date: 2010-03-29 18:17:59
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