21 | Add to Reading ListSource URL: www.ngdc.noaa.govLanguage: English - Date: 2009-10-09 04:12:00
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22 | Add to Reading ListSource URL: www.ngdc.noaa.govLanguage: English - Date: 2009-10-09 04:12:00
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23 | Add to Reading ListSource URL: www.ngdc.noaa.govLanguage: English - Date: 2009-10-24 11:22:28
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24 | Add to Reading ListSource URL: www.ngdc.noaa.govLanguage: English - Date: 2009-11-07 10:13:35
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25 | Add to Reading ListSource URL: www.bgs.ac.ukLanguage: English - Date: 2011-08-23 09:14:16
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26 | Add to Reading ListSource URL: www.bgs.ac.ukLanguage: English - Date: 2011-08-23 09:02:31
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27 | Add to Reading ListSource URL: www.bgs.ac.ukLanguage: English - Date: 2011-08-23 09:09:06
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28 | Add to Reading ListSource URL: www.geomag.usLanguage: English - Date: 2007-04-27 20:46:09
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29 | Add to Reading ListSource URL: www.geomag.usLanguage: English - Date: 2007-04-27 20:46:10
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30 | Add to Reading ListSource URL: iugg.orgLanguage: English - Date: 2012-08-21 04:41:41
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