41 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2011-02-10 19:17:22
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42 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-03-14 15:57:07
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43 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-03-14 14:19:40
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44 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2012-08-27 18:11:20
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45 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2011-08-03 12:28:12
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46 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-10-06 08:08:12
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47 | Add to Reading ListSource URL: www.azgs.az.govLanguage: English - Date: 2011-12-08 17:47:19
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48 | Add to Reading ListSource URL: www.azgs.az.govLanguage: English - Date: 2011-10-05 02:26:50
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49 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2000-04-21 03:00:00
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50 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2001-02-22 03:00:00
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