21 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-06-06 13:18:58
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22 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-05-01 13:48:30
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23 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-07-02 06:40:26
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24 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-07-10 10:05:55
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25 | Add to Reading ListSource URL: www.atsdr.cdc.govLanguage: English - Date: 2011-09-14 15:25:14
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26 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-02-04 07:28:51
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