11 | Add to Reading ListSource URL: www.earthlearningidea.comLanguage: English - Date: 2014-11-17 06:11:36
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12 | Add to Reading ListSource URL: www.smedg.org.auLanguage: English - Date: 2011-04-13 11:47:54
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13 | Add to Reading ListSource URL: www.dnr.mo.govLanguage: English - Date: 2008-10-07 12:17:43
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14 | Add to Reading ListSource URL: www.arch.dcr.state.nc.usLanguage: English - Date: 2007-08-09 10:46:36
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15 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2007-05-23 16:04:22
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16 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:01
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17 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:01
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18 | Add to Reading ListSource URL: www.its.caltech.eduLanguage: English - Date: 2012-10-31 14:35:42
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19 | Add to Reading ListSource URL: www.minsocam.orgLanguage: English - Date: 2014-02-03 07:48:41
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20 | Add to Reading ListSource URL: constantinemetals.com- Date: 2014-09-29 19:14:32
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