21 | Add to Reading ListSource URL: ec.europa.euLanguage: English - Date: 2014-02-18 03:26:42
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22 | Add to Reading ListSource URL: www.geoconvention.comLanguage: English - Date: 2014-04-20 16:00:12
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23 | Add to Reading ListSource URL: ngmdb.usgs.govLanguage: English - Date: 2004-12-20 16:20:06
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24 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2013-08-08 17:56:27
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25 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-11-29 16:07:58
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26 | Add to Reading ListSource URL: www.nogcc.ne.govLanguage: English - Date: 2012-08-21 11:06:00
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27 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2012-09-26 13:17:10
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28 | Add to Reading ListSource URL: www.beg.utexas.eduLanguage: English - Date: 2014-04-02 11:39:33
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29 | Add to Reading ListSource URL: d32ogoqmya1dw8.cloudfront.netLanguage: English - Date: 2013-11-21 14:27:33
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30 | Add to Reading ListSource URL: d32ogoqmya1dw8.cloudfront.netLanguage: English - Date: 2013-11-21 14:27:31
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