71![](https://www.pdfsearch.io/img/f1d0ad6be66a76373141ba931127a37e.jpg) | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2007-03-14 17:21:35
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72![](https://www.pdfsearch.io/img/509c3d11cbf2342feda2530268fabd9f.jpg) | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2003-04-03 12:30:24
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73![](https://www.pdfsearch.io/img/84a1916f4855aec989f129547b42e81f.jpg) | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-09-18 18:02:29
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74![](https://www.pdfsearch.io/img/0ce994a0c7b205f4bf85157fee31fdb8.jpg) | Add to Reading ListSource URL: certmapper.cr.usgs.govLanguage: English - Date: 2001-08-28 20:44:20
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75![](https://www.pdfsearch.io/img/ae4ec062b5648dd129ea25c6e850b1b8.jpg) | Add to Reading ListSource URL: certmapper.cr.usgs.govLanguage: English - Date: 2001-08-28 20:42:13
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76![](https://www.pdfsearch.io/img/eb68c22b9f9ed29846c30076bb499353.jpg) | Add to Reading ListSource URL: certmapper.cr.usgs.govLanguage: English - Date: 2001-08-17 12:43:08
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77![](https://www.pdfsearch.io/img/204d61607ccc3b1ef5effc0fea781bc8.jpg) | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-01-31 18:21:49
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78![](https://www.pdfsearch.io/img/728fddd8fefb2abdb46b0f3b9f2c46e2.jpg) | Add to Reading ListSource URL: certmapper.cr.usgs.govLanguage: English - Date: 2001-08-28 20:15:50
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