11 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2015-01-21 17:23:03
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12 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-12-23 08:41:09
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13 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-12-02 17:22:44
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14 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-10-23 18:37:15
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15 | Add to Reading ListSource URL: ntp.niehs.nih.govLanguage: English - Date: 2014-11-11 13:07:11
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16 | Add to Reading ListSource URL: www.sciencestuff.comLanguage: English - Date: 2013-06-26 15:11:10
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17 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-01-10 12:41:37
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18 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-01-10 12:41:37
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19 | Add to Reading ListSource URL: www.nordion.comLanguage: English - Date: 2014-08-15 21:57:32
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20 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-01-10 12:41:37
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