31![](/pdf-icon.png) | Add to Reading ListSource URL: minerals.usgs.gov- Date: 2001-02-01 18:10:20
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32![](/pdf-icon.png) | Add to Reading ListSource URL: minerals.usgs.gov- Date: 2012-01-03 14:32:11
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33![](/pdf-icon.png) | Add to Reading ListSource URL: minerals.usgs.gov- Date: 2012-01-23 15:00:11
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34![](/pdf-icon.png) | Add to Reading ListSource URL: minerals.usgs.gov- Date: 2015-01-20 18:24:51
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35![](/pdf-icon.png) | Add to Reading ListSource URL: minerals.usgs.gov- Date: 2002-02-14 11:13:01
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36![](/pdf-icon.png) | Add to Reading ListSource URL: minerals.gov.sd- Date: 2016-12-20 07:24:03
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37![](/pdf-icon.png) | Add to Reading ListSource URL: minerals.usgs.gov- Date: 2016-10-25 10:57:49
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38![](/pdf-icon.png) | Add to Reading ListSource URL: minerals.usgs.gov- Date: 2006-05-19 11:00:48
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39![](/pdf-icon.png) | Add to Reading ListSource URL: www.at-minerals.com- Date: 2018-04-06 05:11:23
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40![](/pdf-icon.png) | Add to Reading ListSource URL: minerals.usgs.gov- Date: 2013-01-24 17:46:20
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