21 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1997-11-13 07:51:00
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22 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1997-11-13 07:51:00
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23 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1997-11-13 07:51:05
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24 | Add to Reading ListSource URL: www.uark.eduLanguage: English - Date: 2013-11-20 18:33:45
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25 | Add to Reading ListSource URL: www.sctrails.netLanguage: English - Date: 2001-07-08 14:21:25
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26 | Add to Reading ListSource URL: museums.alaska.govLanguage: English - Date: 2014-04-09 16:20:08
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27 | Add to Reading ListSource URL: www.osha.govLanguage: English - Date: 2013-02-28 12:27:28
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28 | Add to Reading ListSource URL: www.algasan.co.ukLanguage: English - Date: 2011-12-12 10:28:06
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29 | Add to Reading ListSource URL: www.abrasiveengineering.comLanguage: English - Date: 2013-12-16 12:05:14
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30 | Add to Reading ListSource URL: bbsef.orgLanguage: English - Date: 2011-09-12 12:17:02
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