271 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-08-31 11:08:55
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272 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-03-29 16:15:54
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273 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-03-06 12:23:03
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274 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1998-02-24 11:20:30
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275 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-08-06 14:17:38
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276 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2010-01-05 16:32:24
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277 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-01-13 11:22:36
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278 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1998-02-24 11:20:30
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279 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-01-19 09:00:33
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280 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-01-19 08:24:41
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