21 | Add to Reading ListSource URL: www.geosociety.orgLanguage: English - Date: 2009-12-08 17:38:13
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22 | Add to Reading ListSource URL: 1906centennial.orgLanguage: English - Date: 2005-11-10 13:16:27
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23 | Add to Reading ListSource URL: 1906centennial.orgLanguage: English - Date: 2005-11-10 13:17:18
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24 | Add to Reading ListSource URL: 1906centennial.orgLanguage: English - Date: 2005-11-10 13:16:34
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25 | Add to Reading ListSource URL: 1906centennial.orgLanguage: English - Date: 2005-11-10 13:16:54
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26 | Add to Reading ListSource URL: 1906centennial.orgLanguage: English - Date: 2005-11-10 13:16:47
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27 | Add to Reading ListSource URL: 1906centennial.orgLanguage: English - Date: 2005-11-10 13:17:05
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28 | Add to Reading ListSource URL: 1906centennial.orgLanguage: English - Date: 2005-11-10 13:17:33
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29 | Add to Reading ListSource URL: profile.usgs.govLanguage: English - Date: 2012-06-25 18:19:08
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30 | Add to Reading ListSource URL: www.geosociety.orgLanguage: English - Date: 2012-04-20 14:27:47
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