21 | Add to Reading ListSource URL: water.epa.govLanguage: English - Date: 2011-09-10 15:57:44
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22 | Add to Reading ListSource URL: www.mainelegislature.orgLanguage: English - Date: 2013-12-04 18:51:04
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23 | Add to Reading ListSource URL: www.flexpack.orgLanguage: English - Date: 2014-06-02 16:14:10
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24 | Add to Reading ListSource URL: www.serc.si.eduLanguage: English - Date: 2008-03-12 10:57:22
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25 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1998-10-13 08:23:54
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26 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1998-10-13 08:23:54
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27 | Add to Reading ListSource URL: esrd.alberta.caLanguage: English - Date: 2014-02-12 13:01:29
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28 | Add to Reading ListSource URL: ec.europa.euLanguage: English - Date: 2013-10-09 09:45:02
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29 | Add to Reading ListSource URL: www.eac-quality.netLanguage: English - Date: 2010-03-12 10:39:37
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30 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2004-03-01 10:39:33
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