21 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1999-05-13 09:54:27
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22 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1999-05-13 09:54:27
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23 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2003-05-12 10:32:40
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24 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-01-13 08:55:56
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25 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-08-23 14:15:29
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26 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-05-13 09:54:30
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27 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-03-07 14:00:09
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28 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2010-01-26 15:11:14
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29 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2003-02-11 10:34:40
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30 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-03-29 15:12:12
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