71 | Add to Reading ListSource URL: acwi.govLanguage: English - Date: 2008-12-01 13:46:32
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72 | Add to Reading ListSource URL: www.dcnr.state.pa.usLanguage: English - Date: 2014-06-12 08:50:02
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73 | Add to Reading ListSource URL: www.glsc.usgs.govLanguage: English - Date: 2013-03-19 21:57:15
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74 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2012-11-05 11:28:03
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75 | Add to Reading ListSource URL: www.dgs.udel.eduLanguage: English - Date: 2013-03-22 09:01:15
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76 | Add to Reading ListSource URL: www.nr.gov.nl.caLanguage: English - Date: 2010-11-16 15:04:08
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77 | Add to Reading ListSource URL: www.cadsr.udel.eduLanguage: English - Date: 2014-07-22 16:12:54
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78 | Add to Reading ListSource URL: www.dcnr.state.pa.usLanguage: English - Date: 2013-02-04 11:11:29
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79 | Add to Reading ListSource URL: www.dcnr.state.pa.usLanguage: English - Date: 2013-02-04 11:22:13
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80 | Add to Reading ListSource URL: www.flheritage.comLanguage: English - Date: 2011-11-30 11:27:49
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