51 | Add to Reading ListSource URL: www-st.physics.uiowa.eduLanguage: English - Date: 2005-12-13 15:20:40
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52 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-01-28 17:01:52
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53 | Add to Reading ListSource URL: www.mdta.maryland.govLanguage: English |
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54 | Add to Reading ListSource URL: www.virgilscudder.comLanguage: English - Date: 2014-08-27 22:25:24
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55 | Add to Reading ListSource URL: www.monmouthhistory.orgLanguage: English - Date: 2011-06-08 14:17:35
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56 | Add to Reading ListSource URL: wvde.state.wv.usLanguage: English - Date: 2010-05-13 15:22:12
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57 | Add to Reading ListSource URL: www-st.physics.uiowa.eduLanguage: English - Date: 2005-12-15 17:58:20
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58 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2011-04-13 14:38:41
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59 | Add to Reading ListSource URL: psb.vermont.govLanguage: English - Date: 2013-11-04 16:29:53
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60 | Add to Reading ListSource URL: media.wiley.comLanguage: English - Date: 2013-08-27 10:18:46
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