21 | Add to Reading ListSource URL: www.pubs.ext.vt.eduLanguage: English - Date: 2014-10-05 11:43:14
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22 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-08-24 07:27:05
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23 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-02-01 13:11:32
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24 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-09-14 12:24:24
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25 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-08-15 09:10:30
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26 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-03-06 12:19:11
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27 | Add to Reading ListSource URL: pubs.ext.vt.eduLanguage: English - Date: 2014-09-04 11:45:50
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28 | Add to Reading ListSource URL: pubs.ext.vt.eduLanguage: English - Date: 2014-09-04 11:45:13
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29 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2005-10-25 10:16:29
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30 | Add to Reading ListSource URL: www.aapfco.orgLanguage: English - Date: 2013-08-30 16:39:49
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