21 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2012-03-29 12:21:55
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22 | Add to Reading ListSource URL: www.dgs.udel.eduLanguage: English - Date: 2009-07-28 08:05:51
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23 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2000-03-13 11:00:00
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24 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2000-03-13 11:00:00
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25 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-04-19 13:50:45
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26 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-12-11 16:57:24
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27 | Add to Reading ListSource URL: www.maine.govLanguage: English - Date: 2014-03-12 16:22:16
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28 | Add to Reading ListSource URL: www.nt.gov.auLanguage: English - Date: 2012-02-17 00:33:31
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