221 | Add to Reading ListSource URL: rock.geosociety.orgLanguage: English - Date: 2008-06-18 12:09:20
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222 | Add to Reading ListSource URL: rock.geosociety.orgLanguage: English - Date: 2010-12-15 12:49:40
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223 | Add to Reading ListSource URL: rock.geosociety.orgLanguage: English - Date: 2008-06-18 12:23:35
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224 | Add to Reading ListSource URL: rock.geosociety.orgLanguage: English - Date: 2008-06-18 12:14:37
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225 | Add to Reading ListSource URL: rock.geosociety.orgLanguage: English - Date: 2008-04-18 13:40:53
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226 | Add to Reading ListSource URL: rock.geosociety.orgLanguage: English - Date: 2011-05-05 11:32:02
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227 | Add to Reading ListSource URL: rock.geosociety.orgLanguage: English - Date: 2008-06-18 12:23:52
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228 | Add to Reading ListSource URL: rock.geosociety.orgLanguage: English - Date: 2008-06-18 12:23:48
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229 | Add to Reading ListSource URL: www.chs.helena.k12.mt.usLanguage: English - Date: 2007-04-03 15:09:14
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230 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-11-19 09:18:52
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