621 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-01-29 08:22:09
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622 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-01-30 16:26:47
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623 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-01-24 11:09:19
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624 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-12-03 10:52:26
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625 | Add to Reading ListSource URL: www.glenbow.orgLanguage: English - Date: 2004-02-09 13:12:06
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626 | Add to Reading ListSource URL: www.glenbow.orgLanguage: English - Date: 2004-02-09 13:04:30
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627 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-05-13 09:54:27
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628 | Add to Reading ListSource URL: www.cdc.govLanguage: English - Date: 2009-10-19 09:47:23
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629 | Add to Reading ListSource URL: www.nist.govLanguage: English - Date: 2013-01-18 23:02:09
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630 | Add to Reading ListSource URL: epa.govLanguage: English - Date: 2012-04-04 11:50:21
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