11 | Add to Reading ListSource URL: www.iisb.fraunhofer.deLanguage: English - Date: 2015-06-08 11:35:10
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12 | Add to Reading ListSource URL: spectrohelioscope.orgLanguage: English - Date: 2003-06-23 06:04:46
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13 | Add to Reading ListSource URL: pruffle.mit.eduLanguage: English - Date: 2009-06-08 11:31:55
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14 | Add to Reading ListSource URL: www.schoolphysics.co.ukLanguage: English - Date: 2009-11-19 02:06:33
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15 | Add to Reading ListSource URL: pruffle.mit.eduLanguage: English - Date: 2012-11-09 14:47:55
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16 | Add to Reading ListSource URL: www.schoolphysics.co.ukLanguage: English - Date: 2009-11-19 02:06:33
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17 | Add to Reading ListSource URL: www.scientificexploration.orgLanguage: English - Date: 2009-01-12 14:54:22
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18 | Add to Reading ListSource URL: www.philiplaven.comLanguage: English - Date: 2011-05-21 06:47:01
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19 | Add to Reading ListSource URL: www.spsobserver.orgLanguage: English - Date: 2013-12-13 16:59:09
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20 | Add to Reading ListSource URL: www.astro.virginia.eduLanguage: English - Date: 2005-08-22 21:55:12
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