831 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 16:55:29
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832 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 16:59:16
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833 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 17:01:33
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834 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 16:56:14
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835 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 16:56:49
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836 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 17:00:14
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837 | Add to Reading ListSource URL: www.msha.govLanguage: English - Date: 2014-07-24 09:55:36
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838 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1998-09-02 09:18:24
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839 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1997-03-12 10:35:23
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840 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2007-05-07 15:45:15
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