191 | Add to Reading ListSource URL: www.lib.uchicago.eduLanguage: English - Date: 2012-11-14 16:13:45
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192 | Add to Reading ListSource URL: www.lib.uchicago.eduLanguage: English - Date: 2013-01-29 14:09:45
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193 | Add to Reading ListSource URL: www.iowacorn.orgLanguage: English - Date: 2013-07-07 15:42:04
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194 | Add to Reading ListSource URL: www.lib.uchicago.eduLanguage: English - Date: 2014-03-28 17:21:00
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195 | Add to Reading ListSource URL: walrus.wr.usgs.govLanguage: English - Date: 2005-02-14 15:22:52
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196 | Add to Reading ListSource URL: walrus.wr.usgs.govLanguage: English - Date: 2005-02-14 15:22:52
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197 | Add to Reading ListSource URL: www.lib.uchicago.eduLanguage: English - Date: 2013-04-23 15:55:40
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198 | Add to Reading ListSource URL: www.healtheffects.orgLanguage: English - Date: 2006-04-28 09:59:02
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199 | Add to Reading ListSource URL: www.nber.orgLanguage: English - Date: 2008-12-16 15:01:29
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200 | Add to Reading ListSource URL: www.nist.govLanguage: English - Date: 2010-10-28 10:28:39
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