311 | Add to Reading ListSource URL: invention.smithsonian.orgLanguage: English - Date: 2010-10-27 17:39:48
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312 | Add to Reading ListSource URL: www.scholastic.comLanguage: English - Date: 2014-10-03 16:24:08
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313 | Add to Reading ListSource URL: www.academyofinventors.orgLanguage: English - Date: 2012-04-04 11:37:59
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314 | Add to Reading ListSource URL: nevadasciencefair.netLanguage: English - Date: 2013-10-30 01:43:54
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315 | Add to Reading ListSource URL: teachinghistory.orgLanguage: English - Date: 2015-01-05 15:58:45
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316 | Add to Reading ListSource URL: www.nber.orgLanguage: English - Date: 2011-12-05 13:38:39
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317 | Add to Reading ListSource URL: collegiateinventors.orgLanguage: English - Date: 2014-12-09 15:12:14
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318 | Add to Reading ListSource URL: www.navalaviationfoundation.orgLanguage: English - Date: 2014-10-27 08:42:55
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319 | Add to Reading ListSource URL: invent.orgLanguage: English - Date: 2014-12-12 10:29:07
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320 | Add to Reading ListSource URL: www.academyofinventors.orgLanguage: English - Date: 2013-04-23 13:34:34
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