11 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2015-03-10 10:06:08
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12 | Add to Reading ListSource URL: www.gem.org.auLanguage: English - Date: 2012-08-29 04:20:59
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13 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2015-01-23 16:22:24
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14 | Add to Reading ListSource URL: downloads.hindawi.comLanguage: English - Date: 2014-08-28 11:31:00
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15 | Add to Reading ListSource URL: abrasivesinc.comLanguage: English - Date: 2012-10-30 00:34:10
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16 | Add to Reading ListSource URL: www.arch.dcr.state.nc.usLanguage: English - Date: 2007-08-09 10:46:34
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17 | Add to Reading ListSource URL: www.dmme.virginia.gov- Date: 2013-01-16 13:33:56
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18 | Add to Reading ListSource URL: ftp2.cits.rncan.gc.caLanguage: English - Date: 2011-10-15 05:37:50
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19 | Add to Reading ListSource URL: www.minsocam.orgLanguage: English - Date: 2007-11-26 12:51:52
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20 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-03-07 15:33:27
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