321 | Add to Reading ListSource URL: walrus.wr.usgs.govLanguage: English - Date: 2009-11-27 12:26:43
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322 | Add to Reading ListSource URL: www.stat.columbia.eduLanguage: English - Date: 2013-09-18 03:45:36
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323 | Add to Reading ListSource URL: www.federalreserve.govLanguage: English - Date: 2001-08-30 16:52:20
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324 | Add to Reading ListSource URL: scholar.harvard.eduLanguage: English - Date: 2013-05-16 09:34:18
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325 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-06-09 18:54:53
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326 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2007-04-24 12:21:49
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327 | Add to Reading ListSource URL: profile.usgs.govLanguage: English - Date: 2012-06-22 20:43:34
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328 | Add to Reading ListSource URL: www.cs.princeton.eduLanguage: English - Date: 2010-08-18 22:20:55
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329 | Add to Reading ListSource URL: www.itl.nist.govLanguage: English - Date: 2013-11-27 15:34:19
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330 | Add to Reading ListSource URL: geomag.usgs.govLanguage: English - Date: 2012-11-01 16:39:54
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